The M55 was an American quad anti-aircraft machine gun emplacement designed in 1942 by the Kimberley-Clark Corporation. Between 1943 and 1953, about 10,000 M55s were used by the United States Army. It could be towed by a utility vehicle or mounted on an APC. It used four rapid firing 12.7mm (.50 cal) machine guns that fired simultaneously at low flying low speed aircraft.
In Battlefield Vietnam, the M55 is an emplacement used by the United States military. It comprises four heavy machine guns which are fired simultaneously, and a shield to cover the gunner. It is capable of turning around 360 degrees. Its role is essentially an anti-aircraft turret, which is very effective against enemy infantry, helicopters and even jets. It mostly appears near base flags, to aid in defence.
It has limited ammo available but can be resupplied by an American driving an M-113 up next to it. This feat can also be performed by NVA or Viet Cong with a BTR-60. It is impervious to bullets, but is easily destroyed by explosives, like rockets and tank shells.
- Operation Flaming Dart
- Operation Hastings
- Operation Game Warden
- Fall of Lang Vei
- Siege of Khe Sahn
- Defense of Con Thien