Welcome Here is this Vietnam war USAF HGU-1/P Flight Cap US Air Force Pilot Green Helmet Vietnam War. Used to hold headset or earmuffs in place. Great for Your Collection Thanks for Looking a10.The item "USAF HGU-1/P Flight Cap US Air Force Pilot Green Helmet Vietnam War size Med" is in sale since Tuesday, November 04, 2014. This item is in the category "Collectibles\Militaria\Vietnam (1961-75)\Original Period Items\Hats & Helmets". The seller is "air_flight_museum" and is located in Flight Station. This item can be shipped worldwide.