Original U.S. Vietnam War Era USMC APH-5 Flight Helmet with Oxygen Mask & Adjustable Visor Category_Blunderbuss The knife measures 9 5/8"

The knife measures 9 5/8"

under which is just the muzzle gland

though most notably during World War II

Socket Length: 3 3 /4"

having never been issued or even opened

Original U.S. Vietnam War Era USMC APH-5 Flight Helmet with Oxygen Mask & Adjustable Visor Category_Blunderbuss The knife measures 9 5/8"Original Item: Only One Available. This is a Vietnam War Era United States Marine Corps USMC Helicopter Flight Helmet type APH 5 Helmet. It has the correct early type thick roam rubber edge roll, and the base color is white, now painted over with U. S. Navy gold. Wings have been pasted to each side of the top with USMC below it as shown. It still has the internal padding as well as the earphones. It also does have a retractable visor installed, which