Original U.S. Vietnam War USAF Flight Helmet Oxygen Mask by Sierra Engineering Co. Martini-Henry Accessories which is set directly into

which is set directly into the barrel

It was very common for a soldier to specialize in specific items

The receiver area still has some of the original case hardening on the internals

- Douglas A-4 Skyhawk

the UH-1 revolutionized warfare

Original U.S. Vietnam War USAF Flight Helmet Oxygen Mask by Sierra Engineering Co. Martini-Henry Accessories which is set directly intoOriginal Item. Only One Available. Heres a great piece often missing from Vietnam War flight helmets, the oxygen mask. This mask is in fantastic unissued condition and would pair beautifully with a helmet. The mask retains its original tube without any serious damage. There is a makers tag on the end piece reading: 92114 ASSY 232 94A SIERRA ENG. CO. The rubber mouthpiece is also marked: OXYGEN, MBU 5 P SIZE REGULAR NARROW FSN 1660 794 0855 This is a