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.