Star Commander is an officer rank within the Clan military structure. A Star Commander is in charge of either a Star or a Nova. The Inner Sphere equivalent is Lieutenant.
Clan warriors usually require several years of success before promotion to Star Commander. Alternatively, a sibko cadet can test into the position by defeating two opponents during his/her Trial of Position.
Clan Blood Spirit
Clan Cloud Cobra
Clan Fire Mandrill
Clan Hell's Horses
Unlike most other Clans, Clan Hell's Horses has an explicit Nova Commander rank. As they command more troops, these officers could be considered the equivalent of a senior Lieutenant.
Clan Star Adder
Clan Wolf/Clan Wolf-in-Exile
References