Original WW2 US Army Air Force M-3 Flak Helmet Complete With Liner & Chin Strap. Chin strap need minor repair. The item "WW2 US Army Air Force M-3 Flak Helmet Complete With Liner & Chin Strap" is in sale since Monday, September 18, 2017.This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\United States\Hats & Helmets". The seller is "grayhippo" and is located in Beverly Hills, California. This item can be shipped to United States.