World war 2 vest life-preserver, type B-4. W535AC 29304 Air Force, U. The item "WW2 AIR FORCE US ARMY Pilot Life Preserver Vest Type B-4 No.3135 AC-29297 1943" is in sale since Sunday, August 11, 2019. This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\United States\Personal Gear". The seller is "rictho66" and is located in Metuchen, New Jersey. This item can be shipped to United States.