dano1917
RIP
The main reason for this post is that I have seen these helmets turn up occasionally on ebay incorrectly called a medic helmet. It is the insignia of the Illinois 33rd division (national guard). My first wifes grandfather fought with the 33rd. In WW1 the "Prarie Division" served with Australians at the Amiens sector and had units at Verdun and the Meuse-Argonne. The division spent 27 days in active sectors and 32 days in quiet sectors. It captured 3,987 prisoners and advanced 36 kilometers while taking 989 battle deaths and 6,266 wounded.