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A unit of 30-40 soldiers, usually commanded by a lieutenant asisted by an NCO. A platoon is formed by at least two sections or squads (usually 3 or 4) and is smaller than a company. Typically, there are 3-4 platoons in a company. Most platoons are infantry platoons; some carry other designations such as mortar or heavy weapons platoons. A platoon is the smallest military unit led by a commissioned officer

Also a very kick ass movie from Oliver Stone that won Best Picture for 1986.
In the British Army, a platoon is led by a lieutenant or second lieutenant.
It's the same in the Canadian Forces and the U.S. Army.
by Adrian July 01, 2006
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2
when you got so many people in your squad its so big its became a whole army.
shit man i wouldn't fuck with that platoon, they got like 40 naggas
by thatwhitedude February 19, 2015
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