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	|image = Sentinel RGilClan v14.png		|image = Sentinel RGilClan v14.png
	|name = ''Sentinel''		|name = ''Sentinel''
−	|manufacturer = [[Defiance Industries]]<ref name=TRO:SWp62>''Technical Readout: Succession Wars'', pp. 62–63: "STN-3L Sentinel"</ref> <!-- reprinted from TRO:3050U -->	+	|manufacturer = [[Defiance Industries]]<ref name=TRSWp62f>''Technical Readout: Succession Wars'', pp. 62–63: "STN-3L Sentinell"</ref> <!-- reprinted from TRO:3050U -->
−	|model = STN-3L<ref name=TRO:SWp62/>	+	|model = STN-3L<ref name=TRSWp62f />
	|production year = 2652		|production year = 2652
	|year reference = <ref>''[http://www.masterunitlist.info/Unit/Details/2860/ MUL online date for the ''{{PAGENAME}}'']''</ref>		|year reference = <ref>''[http://www.masterunitlist.info/Unit/Details/2860/ MUL online date for the ''{{PAGENAME}}'']''</ref>
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	|feet = biped		|feet = biped
	|mass = 40		|mass = 40
−	|chassis = [[Defiant V]] <!-- <ref name=TRO:SWp62/> -->	+	|chassis = [[Defiant V]] <!-- <ref name=TRSWp62f /> -->
−	|armor = [[Valiant Lamellor]] <!-- <ref name=TRO:SWp62/> -->	+	|armor = [[Valiant Lamellor]] <!-- <ref name=TRSWp62f /> -->
−	|engine = [[Pitban 240]] <!-- <ref name=TRO:SWp62/> -->	+	|engine = [[Pitban 240]] <!-- <ref name=TRSWp62f /> -->
−	|comsys = [[StarLink/Benicia Model AS829G]] <!-- <ref name=TRO:SWp62/> -->	+	|comsys = [[StarLink/Benicia Model AS829G]] <!-- <ref name=TRSWp62f /> -->
−	|T&T = [[Targa-7, Vid-Com-17]] <!-- <ref name=TRO:SWp62/> -->	+	|T&T = [[Targa-7, Vid-Com-17]] <!-- <ref name=TRSWp62f /> -->
−	|heat sinks = 10 [[heat sink|single]] <!-- <ref name=TRO:SWp62/> -->	+	|heat sinks = 10 [[heat sink|single]] <!-- <ref name=TRSWp62f /> -->
−	|speed = 97 <!-- <ref name=TRO:SWp62/> -->	+	|speed = 97 <!-- <ref name=TRSWp62f /> -->
−	|armament = <!-- <ref name=TRO:SWp62/> -->	+	|armament = <!-- <ref name=TRSWp62f /> -->
	* 1x [[UAC/5]]		* 1x [[UAC/5]]
	* 1x [[small laser]]		* 1x [[small laser]]
	* 1x [[Streak SRM-2]]		* 1x [[Streak SRM-2]]
	|BV (1.0) = 614		|BV (1.0) = 614
−	|BV (2.0) = 717<ref name=TRO:SWp62/>	+	|BV (2.0) = 717<ref name=TRSWp62f />
	}}		}}
	==Description==		==Description==
−	The '''''Sentinel''''' is a medium [[BattleMech]] built by [[Defiance Industries]] as an [[infantry]] support and installation defense [['Mech]], originally under exclusive contract for the [[Lyran Commonwealth]]. While initially pleased to have a then-[[Terran Hegemony]] controlled factory manufacturing the 'Mech exclusively for the [[LCAF]], the Lyrans were less so when a [[Star League]] Council amendment in [[2652]] permitted the [[Star League Defense Force]] to purchase a highly advanced version of the design which Houses Steiner, [[House Marik|Marik]] and [[House Davion|Davion]] would not receive until years later.	+	The '''''Sentinel''''' is a medium [[BattleMech]] built by [[Defiance Industries]] as an [[infantry]] support and installation defense [['Mech]], originally under exclusive contract for the [[Lyran Commonwealth]]. While initially pleased to have a then [[Terran Hegemony]] controlled factory manufacturing the 'Mech exclusively for the [[LCAF]], the Lyrans were less so when a [[Star League]] Council amendment in [[2652]] permitted the [[Star League Defense Force]] to purchase a highly advanced version of the design which Houses Steiner, [[House Marik|Marik]] and [[House Davion|Davion]] would not receive until years later.
	The ''Sentinel'' was one of many designs to suffer from the technological decline of the [[Succession Wars era]], with Defiance first losing the ability to manufacture its advanced weapon systems before discontinuing production entirely in [[Production Ceased::3014]] due to lack of both parts and interest. Rather than disappear from the battlefield, the ''Sentinel'' now began to appear in increasing numbers thanks to [[ComStar]] and its massive stockpile of SLDF matériel, both providing the design to the [[Draconis Combine]] prior to the [[War of 3039]] and using it to help outfit its [[Com Guards]].<ref name=TRO2750-26>''Technical Readout: 2750'', p. 26: "STN-3L ''Sentinel''"</ref><ref name=TRO3025R-40>''Technical Readout: 3025 Revised'', p. 40: "STN-3K''Sentinel''"</ref><ref name=TRO3039-254>''Technical Readout: 3039'', p. 254: "STN-3K''Sentinel''"</ref><ref name=TRO3050-100>''Technical Readout: 3050'', pp. 100–101: "''Sentinel''"</ref><ref name=TRO3050R-90>''Technical Readout: 3050 Revised'', pp. 90–91: "STN-3M ''Sentinel''"</ref><ref name=TRO3050U-194>''Technical Readout: 3050 Upgrade'', p. 194: "STN-3L ''Sentinel''"</ref>		The ''Sentinel'' was one of many designs to suffer from the technological decline of the [[Succession Wars era]], with Defiance first losing the ability to manufacture its advanced weapon systems before discontinuing production entirely in [[Production Ceased::3014]] due to lack of both parts and interest. Rather than disappear from the battlefield, the ''Sentinel'' now began to appear in increasing numbers thanks to [[ComStar]] and its massive stockpile of SLDF matériel, both providing the design to the [[Draconis Combine]] prior to the [[War of 3039]] and using it to help outfit its [[Com Guards]].<ref name=TRO2750-26>''Technical Readout: 2750'', p. 26: "STN-3L ''Sentinel''"</ref><ref name=TRO3025R-40>''Technical Readout: 3025 Revised'', p. 40: "STN-3K''Sentinel''"</ref><ref name=TRO3039-254>''Technical Readout: 3039'', p. 254: "STN-3K''Sentinel''"</ref><ref name=TRO3050-100>''Technical Readout: 3050'', pp. 100–101: "''Sentinel''"</ref><ref name=TRO3050R-90>''Technical Readout: 3050 Revised'', pp. 90–91: "STN-3M ''Sentinel''"</ref><ref name=TRO3050U-194>''Technical Readout: 3050 Upgrade'', p. 194: "STN-3L ''Sentinel''"</ref>
	==Weapons and Equipment==		==Weapons and Equipment==
−	The Star League ''Sentinel'' carried a somewhat unique and highly advanced armament for its time. Its primary weapon was a [[Kawabata Weapons Industries]] [[UAC/5]] developed especially for the 3L, and is capable of firing at double the rate of a standard [[AC/5]] at the cost of slightly increased possibility of jamming the weapon until it can be overhauled. The ''Sentinel'' also mounted an advanced Defiance [[Streak SRM-2]], the launcher designed to only fire if it gains a lock, saving ammo until the entire salvo is virtually guaranteed to hit. Unfortunately, the weapon's benefits were hampered by the companion [[small laser]], the swap from the fragile Defiance A-1 for the sturdier Defiance B-1A moved the launcher's ammo feed by half a meter, resulting in ammo jams during abrupt maneuvers. Though [[MechWarrior (pilot)|MechWarriors]] discovered that they could clear a jam in the field by thumping the 'Mech's chest with its right fist, opponents quickly learned to concentrate fire on any ''Sentinel'' performing this, forcing pilots to retreat from battle anyway.<ref name=TRO2750-26/><ref name=TRO3025R-40/><ref name=TRO3039-254/><ref name=TRO3050U-194/>	+	The Star League ''Sentinel'' carried a somewhat unique and highly advanced armament for its time. Its primary weapon was a Kawabata Weapons Industries [[UAC/5]] developed especially for the 3L, and is capable of firing at double the rate of a standard [[AC/5]] at the cost of slightly increased possibility of jamming the weapon until it can be overhauled. The ''Sentinel'' also mounted an advanced Defiance [[Streak SRM-2]], the launcher designed to only fire if it gains a lock, saving ammo until the entire salvo is virtually guaranteed to hit. Unfortunately, the weapon's benefits were hampered by the companion [[small laser]], the swap from the fragile Defiance A-1 for the sturdier Defiance B-1A moved the launcher's ammo feed by half a meter, resulting in ammo jams during abrupt maneuvers. Though [[MechWarrior (pilot)|MechWarriors]] discovered that they could clear a jam in the field by thumping the 'Mech's chest with its right fist, opponents quickly learned to concentrate fire on any ''Sentinel'' performing this, forcing pilots to retreat from battle anyway. <ref name=TRO2750-26/><ref name=TRO3025R-40/><ref name=TRO3039-254/><ref name=TRO3050U-194/>
	Ignoring its weapons loadout, the ''Sentinel'' was a relatively mundanely constructed 'Mech built on a standard [[Defiant V]] chassis and clad in five and half tons of [[Valiant Lamellor]] [[standard armor]]. A dependable [[Pitban 240]] [[fusion engine]] gives the 'Mech a top running speed of 97.2 km/h, but when first manufactured the engine was also blamed as the cause for chronic overheating of the 'Mech. An investigation eventually found instead it was an issue with the heat circulation of the 'Mech's 10 [[single heat sink]]s, which required a field replacement program and redesign for future production.<ref name=TRO2750-26/><ref name=TRO3025R-40/><ref name=TRO3039-254/><ref name=TRO3050-100/><ref name=TRO3050R-90/><ref name=TRO3050U-194/>		Ignoring its weapons loadout, the ''Sentinel'' was a relatively mundanely constructed 'Mech built on a standard [[Defiant V]] chassis and clad in five and half tons of [[Valiant Lamellor]] [[standard armor]]. A dependable [[Pitban 240]] [[fusion engine]] gives the 'Mech a top running speed of 97.2 km/h, but when first manufactured the engine was also blamed as the cause for chronic overheating of the 'Mech. An investigation eventually found instead it was an issue with the heat circulation of the 'Mech's 10 [[single heat sink]]s, which required a field replacement program and redesign for future production.<ref name=TRO2750-26/><ref name=TRO3025R-40/><ref name=TRO3039-254/><ref name=TRO3050-100/><ref name=TRO3050R-90/><ref name=TRO3050U-194/>
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	*; STN-1S : The 1S ''Sentinel'' was the original production model commissioned by House Steiner in [[Introduction Year::2651]]. The 1S lacked the advanced technologies of the 3L, mounting a [[Defiance Model F]] [[AC/2]] instead of the advanced ultra autocannon model, and a Coventry Quad-Rack [[SRM-4]] instead of the [[Streak SRM-2]]. The 1S also mounted a half ton more armor, but is otherwise identical to the 3L. After years of hassles and bureaucratic maneuvering, all Lyran 1S ''Sentinels'' were eventually upgraded to 3L, only to be all but destroyed during the Succession Wars.<ref name=TRO3050U-194/> BV (2.0) = 632<ref>''Record Sheets: 3039 Unabridged'', p. 411</ref>		*; STN-1S : The 1S ''Sentinel'' was the original production model commissioned by House Steiner in [[Introduction Year::2651]]. The 1S lacked the advanced technologies of the 3L, mounting a [[Defiance Model F]] [[AC/2]] instead of the advanced ultra autocannon model, and a Coventry Quad-Rack [[SRM-4]] instead of the [[Streak SRM-2]]. The 1S also mounted a half ton more armor, but is otherwise identical to the 3L. After years of hassles and bureaucratic maneuvering, all Lyran 1S ''Sentinels'' were eventually upgraded to 3L, only to be all but destroyed during the Succession Wars.<ref name=TRO3050U-194/> BV (2.0) = 632<ref>''Record Sheets: 3039 Unabridged'', p. 411</ref>
−	*; STN-3K : The 3K ''Sentinel'' is the downgraded Succession Wars era version of the 3L model. The [[UAC/5]] and [[Streak SRM-2]] have both been downgraded to a [[Defiance Type J]] [[AC/5]] and a [[Holly]] [[SRM-2]] rack. While its speed has stayed the same, the 'Mechs endurance in the field is actually enhanced by an extra ton of autocannon reloads and an extra half ton of armor.<ref name=TRO:SWp62/><ref name=TRO3025R-40/><ref name=TRO3039-254/><ref name=TRO3050U-194/> BV (1.0) = 536;<ref>''Combat Operations'', p. 130</ref> BV (2.0) = 652<ref>''Record Sheets: 3039'', p. 104</ref>	+	*; STN-3K : The 3K ''Sentinel'' is the downgraded Succession Wars era version of the 3L model. The [[UAC/5]] and [[Streak SRM-2]] have both been downgraded to a [[Defiance Type J]] [[AC/5]] and a [[Holly]] [[SRM-2]] rack. While its speed has stayed the same, the 'Mechs endurance in the field is actually enhanced by an extra ton of autocannon reloads and an extra half ton of armor.<ref name=TRSWp62f /><ref name=TRO3025R-40/><ref name=TRO3039-254/><ref name=TRO3050U-194/> BV (1.0) = 536;<ref>''Combat Operations'', p. 130</ref> BV (2.0) = 652<ref>''Record Sheets: 3039'', p. 104</ref>
	*; STN-3KA : The 3KA ''Sentinel'' is an uncommon field refit of the 3K which replaces the [[AC/5]] with a [[large laser]], adds more armor, and three extra [[single heat sink]]s.<ref name=TRO3039-254/> BV (2.0) = 847<ref>''Record Sheets: 3039 Unabridged'', p. 413</ref>		*; STN-3KA : The 3KA ''Sentinel'' is an uncommon field refit of the 3K which replaces the [[AC/5]] with a [[large laser]], adds more armor, and three extra [[single heat sink]]s.<ref name=TRO3039-254/> BV (2.0) = 847<ref>''Record Sheets: 3039 Unabridged'', p. 413</ref>
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	*; STN-3Lb : The [[Star League Defense Force Royal Divisions|Royal version]] of the ''Sentinel'' featured a significantly upgraded weapon loadout, mounting a [[Gauss rifle]] in place of the autocannon and a [[medium laser]] in place of the [[Streak SRM-2]] rack, but retaining the [[small laser]]. To handle the weight of the Gauss rifle it was almost entirely rebuilt using an [[XL engine]] and [[endo steel]] structure, with the one and a half tons of [[ferro-fibrous]] plate enhancing its protection.<ref name=HOK-159>''Historical: Operation Klondike'', p. 159: "SLDF Royal Units - BattleMechs"</ref> BV (2.0) = 1260<ref name=RSOK-35>''Record Sheets: Operation Klondike'', p. 35</ref>		*; STN-3Lb : The [[Star League Defense Force Royal Divisions|Royal version]] of the ''Sentinel'' featured a significantly upgraded weapon loadout, mounting a [[Gauss rifle]] in place of the autocannon and a [[medium laser]] in place of the [[Streak SRM-2]] rack, but retaining the [[small laser]]. To handle the weight of the Gauss rifle it was almost entirely rebuilt using an [[XL engine]] and [[endo steel]] structure, with the one and a half tons of [[ferro-fibrous]] plate enhancing its protection.<ref name=HOK-159>''Historical: Operation Klondike'', p. 159: "SLDF Royal Units - BattleMechs"</ref> BV (2.0) = 1260<ref name=RSOK-35>''Record Sheets: Operation Klondike'', p. 35</ref>
−	*; STN-3M : The downgraded STN-3M model provided by ComStar to the Draconis Combine as part of [[Operation ROSEBUD]] carried attributes of both the 3L and 3K ''Sentinels'', retaining the advanced 'Mech's [[UAC/5]], but replacing the [[Streak SRM-2]] rack with a standard [[SRM-2]] launcher. While House Kurita was angered as much by the loss of the [[lostech]] system as the use of a "foreign" [[Magistracy of Canopus]] manufactured launcher, the swap allowed the [[small laser]] to be upgraded to [[Magna Mk II]] [[medium laser]].<ref name=TRO:SWp62/><ref name=TRO3050-100/><ref name=TRO3050R-90/><ref name=TRO3050U-194/> BV (1.0) = 655;<ref name=CO>''Combat Operations'', p. 125</ref> BV (2.0) = 758	+	*; STN-3M : The downgraded STN-3M model provided by ComStar to the Draconis Combine as part of [[Operation ROSEBUD]] carried attributes of both the 3L and 3K ''Sentinels'', retaining the advanced 'Mech's [[UAC/5]], but replacing the [[Streak SRM-2]] rack with a standard [[SRM-2]] launcher. While House Kurita was angered as much by the loss of the [[lostech]] system as the use of a "foreign" [[Magistracy of Canopus]] manufactured launcher, the swap allowed the [[small laser]] to be upgraded to [[Magna Mk II]] [[medium laser]].<ref name=TRSWp62f /><ref name=TRO3050-100/><ref name=TRO3050R-90/><ref name=TRO3050U-194/> BV (1.0) = 655;<ref name=CO>''Combat Operations'', p. 125</ref> BV (2.0) = 758
−	*; STN-4D : The 4D adds a [[House Davion|Davion]] touch to the ''Sentinel''. The [[Streak SRM-2]] launcher has been completely done away with on this model and the [[UAC/5]] has been replaced with a [[RAC/5]], while the medium laser from the 3M version has been upgraded to an [[ER medium laser]], and its five and a half tons of [[standard armor]] have been replaced with seven tons of [[ferro-fibrous]] plate.<ref name=TRO:SWp62/><ref name=TRO3050U-194/> BV (1.0) = 1,064;<ref>''Combat Operations'', p. 127</ref><ref>''Record Sheets: Upgrades'', p. 70</ref> BV (2.0) = 1,179	+	*; STN-4D : The 4D adds a [[House Davion|Davion]] touch to the ''Sentinel''. The [[Streak SRM-2]] launcher has been completely done away with on this model and the [[UAC/5]] has been replaced with a [[RAC/5]], while the medium laser from the 3M version has been upgraded to an [[ER medium laser]], and its five and a half tons of [[standard armor]] have been replaced with seven tons of [[ferro-fibrous]] plate.<ref name=TRSWp62f /><ref name=TRO3050U-194/> BV (1.0) = 1,064;<ref>''Combat Operations'', p. 127</ref><ref>''Record Sheets: Upgrades'', p. 70</ref> BV (2.0) = 1,179
−	*; STN-5WB : This variant was produced by Defiance after it was lost to the [[Word of Blake]] during the [[Jihad]]. Built on the same chassis as the 3L, the 5WB adds one ton of armor, uses a [[light engine]] for power, and replaces the weapons with a pair of [[light AC/5]]s that are fed from a single, one-ton ammunition bin, backed up by three [[ER medium laser]]s.<ref name=TRO:SWp62/><ref name=TRO3050U-194/> BV (2.0) = 999	+	*; STN-5WB : This variant was produced by Defiance after it was lost to the [[Word of Blake]] during the [[Jihad]]. Built on the same chassis as the 3L, the 5WB adds one ton of armor, uses a [[light engine]] for power, and replaces the weapons with a pair of [[light AC/5]]s that are fed from a single, one-ton ammunition bin, backed up by three [[ER medium laser]]s.<ref name=TRSWp62f /><ref name=TRO3050U-194/> BV (2.0) = 999
	*; STN-6S : This ''Sentinel'' variant uses a [[Clan]]-spec [[XL engine]] and an [[XL Gyro]] to free weight. Its primary weapon is an [[UAC/5]], supplemented by a Clan-grade [[ER medium laser]] and two [[Thunderbolt 5]] missile launchers. Two tons of ammo are present for the Thunderbolts and the autocannon gets one ton of ammunition, all protected by [[CASE II]] systems. Six and a half tons of armor protects the 'Mech. BV (2.0) = 1,089<ref>''Recognition Guide: ilClan, vol. 14'', p. 17</ref>		*; STN-6S : This ''Sentinel'' variant uses a [[Clan]]-spec [[XL engine]] and an [[XL Gyro]] to free weight. Its primary weapon is an [[UAC/5]], supplemented by a Clan-grade [[ER medium laser]] and two [[Thunderbolt 5]] missile launchers. Two tons of ammo are present for the Thunderbolts and the autocannon gets one ton of ammunition, all protected by [[CASE II]] systems. Six and a half tons of armor protects the 'Mech. BV (2.0) = 1,089<ref>''Recognition Guide: ilClan, vol. 14'', p. 17</ref>
−	*; STN-C : The STN-C is a Combine upgrade of the 3M model, with the [[medium laser]] removed in order to carry a [[C3 slave unit]].<ref name=TRO:SWp62/><ref name=TRO3050U-194/> BV (1.0) = 586 (C3: 47);<ref name=CO/> BV (2.0) = 689	+	*; STN-C : The STN-C is a Combine upgrade of the 3M model, with the [[medium laser]] removed in order to carry a [[C3 slave unit]].<ref name=TRSWp62f /><ref name=TRO3050U-194/> BV (1.0) = 586 (C3: 47);<ref name=CO/> BV (2.0) = 689
−	==Design Quirks==	+	== Design Quirks ==
	The ''Sentinel'' is subject the following [[Design Quirks]]:<ref name=BMM85>''BattleMech Manual'', Fourth Printing, p. 94: "BattleMech Quirk Table"</ref><ref>[https://bg.battletech.com/wp-content/uploads/2022/09/BattleMech-Manual-2022-09-14-v6.01.pdf ''BattleMech Manual Errata (Version 6.01)''], p. 9</ref>		The ''Sentinel'' is subject the following [[Design Quirks]]:<ref name=BMM85>''BattleMech Manual'', Fourth Printing, p. 94: "BattleMech Quirk Table"</ref><ref>[https://bg.battletech.com/wp-content/uploads/2022/09/BattleMech-Manual-2022-09-14-v6.01.pdf ''BattleMech Manual Errata (Version 6.01)''], p. 9</ref>
	* [[Improved Communications]]		* [[Improved Communications]]
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	==Bibliography==		==Bibliography==
−	{{div col|colwidth=25em}}	+	<div class="desktop-3-col">
	* ''[[BattleMech Manual]]''		* ''[[BattleMech Manual]]''
	* ''[[Combat Operations]]''		* ''[[Combat Operations]]''
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	* ''[[Technical Readout: 3050 Revised]]''		* ''[[Technical Readout: 3050 Revised]]''
	* ''[[Technical Readout: 3050 Upgrade]]''		* ''[[Technical Readout: 3050 Upgrade]]''
−	{{div col end}}	+	</div>
	[[Category:'Mechs]]		[[Category:'Mechs]]

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{{InfoBoxBattleMech |image = Sentinel RGilClan v14.png |name = ''Sentinel'' |manufacturer = [[Defiance Industries]]<ref name=TRSWp62f>''Technical Readout: Succession Wars'', pp. 62–63: "STN-3L Sentinell"</ref> <!-- reprinted from TRO:3050U --> |model = STN-3L<ref name=TRSWp62f /> |production year = 2652 |year reference = <ref>''[http://www.masterunitlist.info/Unit/Details/2860/ MUL online date for the ''{{PAGENAME}}'']''</ref> |cost = 3,292,030 [[C-bill]]s |Tech Base = Inner Sphere |mech type = BattleMech |feet = biped |mass = 40 |chassis = [[Defiant V]] <!-- <ref name=TRSWp62f /> --> |armor = [[Valiant Lamellor]] <!-- <ref name=TRSWp62f /> --> |engine = [[Pitban 240]] <!-- <ref name=TRSWp62f /> --> |comsys = [[StarLink/Benicia Model AS829G]] <!-- <ref name=TRSWp62f /> --> |T&T = [[Targa-7, Vid-Com-17]] <!-- <ref name=TRSWp62f /> --> |heat sinks = 10 [[heat sink|single]] <!-- <ref name=TRSWp62f /> --> |speed = 97 <!-- <ref name=TRSWp62f /> --> |armament = <!-- <ref name=TRSWp62f /> --> * 1x [[UAC/5]] * 1x [[small laser]] * 1x [[Streak SRM-2]] |BV (1.0) = 614 |BV (2.0) = 717<ref name=TRSWp62f /> }} ==Description== The '''''Sentinel''''' is a medium [[BattleMech]] built by [[Defiance Industries]] as an [[infantry]] support and installation defense [['Mech]], originally under exclusive contract for the [[Lyran Commonwealth]]. While initially pleased to have a then [[Terran Hegemony]] controlled factory manufacturing the 'Mech exclusively for the [[LCAF]], the Lyrans were less so when a [[Star League]] Council amendment in [[2652]] permitted the [[Star League Defense Force]] to purchase a highly advanced version of the design which Houses Steiner, [[House Marik|Marik]] and [[House Davion|Davion]] would not receive until years later. The ''Sentinel'' was one of many designs to suffer from the technological decline of the [[Succession Wars era]], with Defiance first losing the ability to manufacture its advanced weapon systems before discontinuing production entirely in [[Production Ceased::3014]] due to lack of both parts and interest. Rather than disappear from the battlefield, the ''Sentinel'' now began to appear in increasing numbers thanks to [[ComStar]] and its massive stockpile of SLDF matériel, both providing the design to the [[Draconis Combine]] prior to the [[War of 3039]] and using it to help outfit its [[Com Guards]].<ref name=TRO2750-26>''Technical Readout: 2750'', p. 26: "STN-3L ''Sentinel''"</ref><ref name=TRO3025R-40>''Technical Readout: 3025 Revised'', p. 40: "STN-3K''Sentinel''"</ref><ref name=TRO3039-254>''Technical Readout: 3039'', p. 254: "STN-3K''Sentinel''"</ref><ref name=TRO3050-100>''Technical Readout: 3050'', pp. 100–101: "''Sentinel''"</ref><ref name=TRO3050R-90>''Technical Readout: 3050 Revised'', pp. 90–91: "STN-3M ''Sentinel''"</ref><ref name=TRO3050U-194>''Technical Readout: 3050 Upgrade'', p. 194: "STN-3L ''Sentinel''"</ref> ==Weapons and Equipment== The Star League ''Sentinel'' carried a somewhat unique and highly advanced armament for its time. Its primary weapon was a Kawabata Weapons Industries [[UAC/5]] developed especially for the 3L, and is capable of firing at double the rate of a standard [[AC/5]] at the cost of slightly increased possibility of jamming the weapon until it can be overhauled. The ''Sentinel'' also mounted an advanced Defiance [[Streak SRM-2]], the launcher designed to only fire if it gains a lock, saving ammo until the entire salvo is virtually guaranteed to hit. Unfortunately, the weapon's benefits were hampered by the companion [[small laser]], the swap from the fragile Defiance A-1 for the sturdier Defiance B-1A moved the launcher's ammo feed by half a meter, resulting in ammo jams during abrupt maneuvers. Though [[MechWarrior (pilot)|MechWarriors]] discovered that they could clear a jam in the field by thumping the 'Mech's chest with its right fist, opponents quickly learned to concentrate fire on any ''Sentinel'' performing this, forcing pilots to retreat from battle anyway. <ref name=TRO2750-26/><ref name=TRO3025R-40/><ref name=TRO3039-254/><ref name=TRO3050U-194/> Ignoring its weapons loadout, the ''Sentinel'' was a relatively mundanely constructed 'Mech built on a standard [[Defiant V]] chassis and clad in five and half tons of [[Valiant Lamellor]] [[standard armor]]. A dependable [[Pitban 240]] [[fusion engine]] gives the 'Mech a top running speed of 97.2 km/h, but when first manufactured the engine was also blamed as the cause for chronic overheating of the 'Mech. An investigation eventually found instead it was an issue with the heat circulation of the 'Mech's 10 [[single heat sink]]s, which required a field replacement program and redesign for future production.<ref name=TRO2750-26/><ref name=TRO3025R-40/><ref name=TRO3039-254/><ref name=TRO3050-100/><ref name=TRO3050R-90/><ref name=TRO3050U-194/> With a powerful [[Targa-7, Vid-Com-17]] targeting system and [[StarLink/Benicia Model AS829G]] communications package, the ''Sentinel'' was ideal for long-range patrols or mobile observation. Able to operate on multiple frequencies, it could not only closely monitor and command units operating under it, but also maintain contact with rear-area [[artillery]] for fire support.<ref name=TRO2750-26/><ref name=TRO3025R-40/> ==Variants== *; STN-1S : The 1S ''Sentinel'' was the original production model commissioned by House Steiner in [[Introduction Year::2651]]. The 1S lacked the advanced technologies of the 3L, mounting a [[Defiance Model F]] [[AC/2]] instead of the advanced ultra autocannon model, and a Coventry Quad-Rack [[SRM-4]] instead of the [[Streak SRM-2]]. The 1S also mounted a half ton more armor, but is otherwise identical to the 3L. After years of hassles and bureaucratic maneuvering, all Lyran 1S ''Sentinels'' were eventually upgraded to 3L, only to be all but destroyed during the Succession Wars.<ref name=TRO3050U-194/> BV (2.0) = 632<ref>''Record Sheets: 3039 Unabridged'', p. 411</ref> *; STN-3K : The 3K ''Sentinel'' is the downgraded Succession Wars era version of the 3L model. The [[UAC/5]] and [[Streak SRM-2]] have both been downgraded to a [[Defiance Type J]] [[AC/5]] and a [[Holly]] [[SRM-2]] rack. While its speed has stayed the same, the 'Mechs endurance in the field is actually enhanced by an extra ton of autocannon reloads and an extra half ton of armor.<ref name=TRSWp62f /><ref name=TRO3025R-40/><ref name=TRO3039-254/><ref name=TRO3050U-194/> BV (1.0) = 536;<ref>''Combat Operations'', p. 130</ref> BV (2.0) = 652<ref>''Record Sheets: 3039'', p. 104</ref> *; STN-3KA : The 3KA ''Sentinel'' is an uncommon field refit of the 3K which replaces the [[AC/5]] with a [[large laser]], adds more armor, and three extra [[single heat sink]]s.<ref name=TRO3039-254/> BV (2.0) = 847<ref>''Record Sheets: 3039 Unabridged'', p. 413</ref> *; STN-3KB : The 3KB ''Sentinel'' is an uncommon field refit of the 3K. This variant replaces the [[AC/5]] with a [[PPC]] and three extra [[single heat sink]]s.<ref name=TRO3039-254/> BV (2.0) = 823<ref>''Record Sheets: 3039 Unabridged'', p. 414</ref> *; STN-3Lb : The [[Star League Defense Force Royal Divisions|Royal version]] of the ''Sentinel'' featured a significantly upgraded weapon loadout, mounting a [[Gauss rifle]] in place of the autocannon and a [[medium laser]] in place of the [[Streak SRM-2]] rack, but retaining the [[small laser]]. To handle the weight of the Gauss rifle it was almost entirely rebuilt using an [[XL engine]] and [[endo steel]] structure, with the one and a half tons of [[ferro-fibrous]] plate enhancing its protection.<ref name=HOK-159>''Historical: Operation Klondike'', p. 159: "SLDF Royal Units - BattleMechs"</ref> BV (2.0) = 1260<ref name=RSOK-35>''Record Sheets: Operation Klondike'', p. 35</ref> *; STN-3M : The downgraded STN-3M model provided by ComStar to the Draconis Combine as part of [[Operation ROSEBUD]] carried attributes of both the 3L and 3K ''Sentinels'', retaining the advanced 'Mech's [[UAC/5]], but replacing the [[Streak SRM-2]] rack with a standard [[SRM-2]] launcher. While House Kurita was angered as much by the loss of the [[lostech]] system as the use of a "foreign" [[Magistracy of Canopus]] manufactured launcher, the swap allowed the [[small laser]] to be upgraded to [[Magna Mk II]] [[medium laser]].<ref name=TRSWp62f /><ref name=TRO3050-100/><ref name=TRO3050R-90/><ref name=TRO3050U-194/> BV (1.0) = 655;<ref name=CO>''Combat Operations'', p. 125</ref> BV (2.0) = 758 *; STN-4D : The 4D adds a [[House Davion|Davion]] touch to the ''Sentinel''. The [[Streak SRM-2]] launcher has been completely done away with on this model and the [[UAC/5]] has been replaced with a [[RAC/5]], while the medium laser from the 3M version has been upgraded to an [[ER medium laser]], and its five and a half tons of [[standard armor]] have been replaced with seven tons of [[ferro-fibrous]] plate.<ref name=TRSWp62f /><ref name=TRO3050U-194/> BV (1.0) = 1,064;<ref>''Combat Operations'', p. 127</ref><ref>''Record Sheets: Upgrades'', p. 70</ref> BV (2.0) = 1,179 *; STN-5WB : This variant was produced by Defiance after it was lost to the [[Word of Blake]] during the [[Jihad]]. Built on the same chassis as the 3L, the 5WB adds one ton of armor, uses a [[light engine]] for power, and replaces the weapons with a pair of [[light AC/5]]s that are fed from a single, one-ton ammunition bin, backed up by three [[ER medium laser]]s.<ref name=TRSWp62f /><ref name=TRO3050U-194/> BV (2.0) = 999 *; STN-6S : This ''Sentinel'' variant uses a [[Clan]]-spec [[XL engine]] and an [[XL Gyro]] to free weight. Its primary weapon is an [[UAC/5]], supplemented by a Clan-grade [[ER medium laser]] and two [[Thunderbolt 5]] missile launchers. Two tons of ammo are present for the Thunderbolts and the autocannon gets one ton of ammunition, all protected by [[CASE II]] systems. Six and a half tons of armor protects the 'Mech. BV (2.0) = 1,089<ref>''Recognition Guide: ilClan, vol. 14'', p. 17</ref> *; STN-C : The STN-C is a Combine upgrade of the 3M model, with the [[medium laser]] removed in order to carry a [[C3 slave unit]].<ref name=TRSWp62f /><ref name=TRO3050U-194/> BV (1.0) = 586 (C3: 47);<ref name=CO/> BV (2.0) = 689 == Design Quirks == The ''Sentinel'' is subject the following [[Design Quirks]]:<ref name=BMM85>''BattleMech Manual'', Fourth Printing, p. 94: "BattleMech Quirk Table"</ref><ref>[https://bg.battletech.com/wp-content/uploads/2022/09/BattleMech-Manual-2022-09-14-v6.01.pdf ''BattleMech Manual Errata (Version 6.01)''], p. 9</ref> * [[Improved Communications]] * [[Ammunition Feed Problem|Ammunition Feed Problem (Streak SRM-2)]] <!-- No Torso Twist removed by errata --> ==Notes== * In German products, the unit's proper name was translated to '''''Wächter'''''. The model code was accordingly changed to '''WCT-3R'''. ==Gallery== <gallery> Sentinel.jpg|Original STN-3L ''Sentinel'' from ''[[Technical Readout: 2750|TRO:2750]]'' STN-SENTINEL.png|STN-3K ''Sentinel'' from ''[[Technical Readout: 3025 Revised|TRO:3025 Revised]]'' STN-3.png|STN-3M ''Sentinel'' from ''[[Technical Readout: 3050|TRO:3050]]'' Sentinel RGilClan v14.png|''Sentinel'' from ''[[Recognition Guide: ilClan, vol. 14|RG:ilClan v14]]'' STN-3KSENTINEL.png|STN-3K ''Sentinel'' from ''[[Technical Readout: 3039|TRO:3039]]'' 3050U Sentinel.jpg|STN-3L ''Sentinel'' from ''[[Technical Readout: 3050 Upgrade|TRO:3050 Upgrade]]'' Sentinel Shrapnel003.png|''Sentinel'' from [[Shrapnel_(magazine)#Issue_3|''Shrapnel'' #3]] CCG Counterstrike Sentinel.jpg|STN-3L ''Sentinel'' in Motion from ''[[BattleTech Trading Card Game|CCG]]'' ComStar Command Level II - Sentinel.jpg|''Sentinel'' miniature from ''[[BattleTech: ComStar Command Level II]]'' </gallery> ==References== <references /> ==Bibliography== <div class="desktop-3-col"> * ''[[BattleMech Manual]]'' * ''[[Combat Operations]]'' * ''[[Historical: Operation Klondike]]'' * ''[[Recognition Guide: ilClan, vol. 14]]'' * ''[[Record Sheets: 3025/3026]]'' * ''[[Record Sheets: 3039]]'' * ''[[Record Sheets: 3050]]'' * ''[[Record Sheets: 3050 Upgrade (Clan & Star League)]]'' * ''[[Record Sheets: 3060]]'' * ''[[Record Sheets: Operation Klondike]]'' * ''[[Record Sheets: Upgrades]]'' * ''[[Technical Readout: 2750]]'' * ''[[Technical Readout: 3025 Revised]]'' * ''[[Technical Readout: 3039]]'' * ''[[Technical Readout: 3050]]'' * ''[[Technical Readout: 3050 Revised]]'' * ''[[Technical Readout: 3050 Upgrade]]'' </div> [[Category:'Mechs]] [[Category:ComStar BattleMechs]] [[Category:Draconis Combine BattleMechs]] [[Category:Free Rasalhague Republic BattleMechs]] [[Category:Free Worlds League BattleMechs]] [[Category:Lyran Commonwealth BattleMechs]] [[Category:Star League BattleMechs]] [[Category:SLDF Royal BattleMechs]] [[Category:C3 Slave Equipped BattleMechs]] [[Category:German renamed units]]

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