During the [[Succession Wars]], many MechWarriors owned their 'Mechs and passed them down through generations. It was not uncommon that a 'Mech might be centuries-old with numerous repairs and replacements. That custom changed radically following the conclusion of the [[Fourth Succession War]]. The recovery of a [[Star League]] library core resulted in the rediscovery of much [[LosTech]]; only the Great Houses could afford the massive amounts of new construction that followed. Consequently, House militaries own most new 'Mechs in service in the Inner Sphere in the post-Fourth Succession War period. Among the [[Clans]], all property belongs to the Clan and so a Clansman MechWarrior never owns his 'Mech.