M1903 Springfield mark 1 formally the United States Rifle, Caliber .30-06, Model 1903

The M1903 Springfield, formally the United States Rifle, Caliber .30-06, Model 1903, is an American 5-round magazine fed, bolt-action service repeating rifle, used primarily during the first half of the 20th century. It was officially adopted as a United States military bolt-action rifle on June 19, 1903, and saw service in World War I. It was officially replaced as the standard infantry rifle by the faster-firing semi-automatic 8-round M1 Garand starting in 1937. However, the M1903 Springfield remained in service as a standard issue infantry rifle during World War II, since the U.S. entered the war without sufficient M1 rifles to arm all troops. It also remained in service as a sniper rifle during World War II, the Korean War, and even in the early stages of the Vietnam War.