Ww2 US Army Air Force A14 demand oxygen mask size Small. See pics for other markings. The item "Ww2 US Army Air Force A14 demand oxygen mask size Small" is in sale since Monday, June 3, 2019. This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\United States\Other US WWII Original Items". The seller is "jdfinks" and is located in Troy, Ohio.This item can be shipped to United States.