On DDay all assault troops were issued the parachutist first aid kit. The most common place you would see them by far is attached to their first aid pouches. On assault vests you would often see them attached on the shoulder. I've never seen one attached to a helmet.
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5th Ranger Battalion
Easy Company
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Onsale this weekend at ATF!
https://www.atthefront.com/product-p/usgfap.htm
Nice catch!! Gotta love that life belt roped to the haversack too!