The U.S. Marine Corps adopted the M1C as their official sniper rifle in 1951. This USMC 1952 Sniper's Rifle or MC52 was an M1C with the commercial Stith Bear Cub scope manufactured by the Kollmorgen Optical Company under the military designation: Telescopic Sight - Model 4XD-USMC. The Kollmorgen scope with a slightly modified Griffin & Howe mount was designated MC-1. The MC52 was also too late to see extensive combat in Korea, but it remained in Marine Corps inventories until replaced by bolt-action rifles during the Vietnam War. The U.S. Navy has also used the Garand, rechambered for the 7.62×51mm NATO round.