Platoon is a term from military science. In an army, a platoon is a unit of thirty to forty soldiers typically commanded by a first lieutenant[?] who is assisted with either a second lieutenant[?] or sergeant major[?] as platoon lieutenants; a platoon may also be commanded by a second lieutenant with a sergeant major as his platoon lieutenant. A platoon is usually formed of at least two squads and is smaller than a company. Most platoons are infantry platoons; some carry other designations such as mortar or heavy weapons platoons.