High Quality Content by WIKIPEDIA articles! A fireteam is a small military unit of infantry. It is the smallest unit in the militaries that use it and is the primary unit upon which infantry organization is based in the British Army, Royal Air Force Regiment, Royal Marines, United States Army, United States Marine Corps, United States Air Force Security Forces, Canadian Forces, and Australian Army. Fireteams generally consist of four or fewer soldiers and are usually grouped by two or three teams into a squad or section.