US M1917 Bayonet with canvas frog

The M1917 bayonet came about due to the U.S. entry into the First World War. U.S. makers were producing the Pattern 1914 rifle and Pattern 1913 bayonet for the British. Upon entering the War, the rifle and bayonet were designated Model of 1917 and production taken over to equip U.S. forces. The M1917 rifle was nearly identical to the British Pattern 1913 rifle, so was often referred to in U.S. service as the "Enfield.