Roadkill101
Explorer
I response to Clashmore Dave's reference to sub-divisions being called armies. Yes there are sub units of the US Army refered to as an army, though in my experience they were refered to as a Corp. Unless things have greatly changed when i was in the Army back in '91, the US Army divided itself into the following units (smallest to largest): Firing Team, Squad, Platoon, Company (some US Cavalry units use the term Troop here), Battalion (some US Cav units use the term Squadron here), Brigade (some US Cav units use the term Regiment here), Division and finally Corp. It generally takes a minimal of two or more of a smaller unit to make up the next larger sized unit to the best of my knowledge, thus not all units of the same name are necessarily equal in manpower.