The Bell UH-1N Twin Huey is a twin-engine medium military helicopter. A member of the numerous Huey family, it first flew in 1969. The UH-1N has a fifteen-seat configuration, with one pilot and fourteen passengers. From late 1970, the UH-1N re-equipped the USAF 20th Special Operations Squadron in Vietnam, replacing the single-engined UH-1F and UH-1P. The United States Air Force currently employs UH-1Ns to fulfill its ICBM mission, providing a utility helicopter for transport between bases and launch sites. The last combat deployment of the UH-1N by the Marines was to Afghanistan in 2010. An external load of up to 5,000 lb (2,268 kg) can be carried. It has a crew consisting of 4 (pilot, co-pilot, crew chief, gunner) and a capacity of 8 combat-equipped troops. The UH-1N has a maximum speed of 135 mph and a range of 286 mi. It carries an armament consisting of a 2.75-inch (70 mm) rocket pods, a 0.50 in (12.7 mm) GAU-16 machine gun and a 7.62 mm (0.308 in) GAU-17 minigun or 7.62 mm (0.308 in) M240 lightweight machine gun.