The U.S. procured around 2.7 million M1911 and M1911A1 pistols in military contracts during its service life. The M1911 was replaced by the adoption of the 9 mm Beretta M9 pistol as the standard U.S. sidearm in 1985 and it officially entered service in 1990. But, due to its popularity among users, it has not been completely phased out. Modernized derivative variants of the M1911 are still in use by some units of the U.S. Army Special Forces, U.S. Marine Corps and the U.S. Navy.