Original WW2 US Navy USMC M-450 Khaki Flight Helmet. The item “Original WW2 US Navy USMC M-450 Khaki Flight Helmet” is in sale since Thursday, January 30, 2020. This item is in the category “Collectibles\Militaria\WW II (1939-45)\Original Period Items\United States\Hats & Helmets”. The seller is “cminfar” and is located in Bradenton, Florida. This item can be shipped to United States.