M40 GAS MASK OPERATOR'S MANUAL INSTUCTION BOOKLET M40A1 M42A2 TM-3-4240-346-10
Model: Training Manual. As military gear ages and sees more use, it might fall into the Grade B category. Wrap the tape around your head, ensuring it is snug but not tight. X-Short: 4'11" - 5'3". Regular: 5'7" - 5'11".