Have you ever noticed how seldom you see WWII GIs with their helmet chinstraps fastened.
There's a reason for that. Apparently, the concussion from a nearby explosion could cause the helmet to become a hazard if the chinstrap was fastened, as the strap could cause the neck to be injured as the helmet was jerked back by the blast. For a long time I thought that this was merely collector folklore, until I encountered these original documents.




