The M14 rifle, officially the United States Rifle, 7.62 mm, M14, is an American semi-automatic rifle(though there are some automatics out there) that fires 7.62×51mm NATO (.308 in) ammunition. It became the standard-issued rifle for the U.S. military in 1959replacing the M1 Garand rifle in the U.S. Army by 1961 and the U.S. Marine Corps by 1965 until being replaced by the M16 rifle beginning in 1964. The M14 was used by U.S. Army, Navy, and Marine Corps for basic and advanced individual training (AIT) from the mid-1960s to the early 1970s.