The Tangos, also known as Armoured Troop Carriers (ATC), were LCM-6 landing crafts modified for riverine patrol missions. They were used by the Mobile Riverine Force of the United States Army in the Vietnam War. The troops of the 9th Infantry Division used them more than other groups in the earlier parts of the war, but as they proved themselves they were deployed elsewhere. They were also used by South Vietnamese troops. The ATC weighed 66 tons, and 56.5-foot (17.2 m) long. They had a crew of 7. They had a top speed of 8.5 knots (15.7 km/h; 9.8 mph).