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Vietnam War US Army helicopter pilot's flight helmet from the 71st Assault Helicopter Co. – ”Firebirds”. – Maine Military Museum
APH-4 Flight Helmet : Naval Air Mechanic (Weapons) A J R Curran, Royal Australian Navy Helicopter Flight Vietnam | Australian War Memorial
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U.S. Army Surplus Vietnam War Helicopter Pilot Gentex SPH-4 Helmet, Used - 728300, Helmets & Accessories at Sportsman's Guide
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