>In the US the term "troop" refers more generally to military personal, but it is does not by today's standard refer to a specific number of military personnel. The terms (in the Army) generally used to refer to size in decending order is:
>Division -> Brigade -> Battalion -> Company -> Platoon
And for the sizes and related info
http://usmilitary.about.com/od/army/l/blchancommand.htm
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