1950s Named H-4 Flight Helmet Korean Vietnam War Pilot. The item "1950s Named H-4 Flight Helmet Korean Vietnam War Pilot" is in sale since Wednesday, April 3, 2019. This item is in the category "Collectibles\Militaria\1954-60\Original Period Items". The seller is "theinsigne" and is located in Fresno, California. This item can be shipped worldwide.