Anti-gas detection armbands
These brown or green paper british made armbands are intended to detect toxic gas. Worn on the uniform’s sleeve, they were distributed to british and american forces for D-Day. They are impregnated with a blistering gaz sensitive pain, so the armbands changes color and becomes pink or red when sensing toxic gas. The armbands are also worn by the paratroopers of the 101st Airborne.