Army Component Command

From Halopedia, the Halo wiki

Army Component Commands are a command organisation within the UNSC Army. Prior to the Human-Covenant War, Army Component Commands were based out of an assigned colony world with the task of overseeing the administration of given Army units assigned to that colony, with operational authority the responsibility of Unified Ground Command (UNICOM) task forces. During the war, many Army Component Commands were "temporarily" disestablished due to the frequency of glassing attacks and the reassignment of Army units to other worlds, and were replaced by sector-level working groups based out of Earth and Reach.[1]