Authentic WW1 USMC British Made Brodie Helmet w/ EGAAuthentic WW1, British Made, USMC Steel Brodie Helmet w EGA When the US entered the war in Europe in 1917, they were not yet equipped with helmets. US servicemen were initially supplied with the British made Mk. I Brodie helmet. Eventually the US did produce their own combat helmet, the M1917, by copying the British Mk. I. There are a few differences to note. The chinstrap swivel bales on the M17 are made of a heavier gage, riveted steel and the Mk. I