How to identify a US M1 helmet?
When the United States entered the war in 1917, the American army did not have its own combat helmet. Troops arriving in Europe receive British Mk I Brodie helmets (and troops integrated into French units receive French M15 Adrian helmets). In 1918, in order to standardize the troops, the United States began to manufacture a version of the Mk I, designated M-1917, producing more than 2,700,000 copies before the end of hostilities.
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