The M1 Garand was the standard semi-automatic rifle that was to replace the bolt-action M1903 Springfield from 1936. The switch did not happen instantaneously and the Springfield continued in service in some roles throughout the Second World War.
The Garand was chambered for the .30-06 Springfield rifle cartridge. It was called by General George Patton, “the greatest battle implement ever devised”. During WW2 the M1 Garand gave the U.S. forces a distinct advantage over the Axis enemies who were still largely reliant on the slower bolt action rifle.
The M1 continued to be used in large numbers until 1963 and to a lesser degree up until 1976. It remains in service for drill purposes to this day.