#Miyamon CWU This is a rare and valuable piece of flight gear: a jet pilot helmet. It's a REDAR hose used by USN/USMC jet pilots to connect their flight helmet's oxygen mask (miniature regulator) to the aircraft. It's perfect for display, especially when paired with flight helmets/oxygen masks like the APH-6 and HGU-33/34 used by F-14 and F/A-18 pilots in the US Navy and Marine Corps. This is an old item, a military surplus.