Capt. Dennis Zabka checks his mask for leaks at Barksdale Air Force Base, La., Aug. 27, 2012. Zabka, a pilot assigned to the 11th Bomb Squadron. is competing in the Global Strike Challenge. Master Sgt. Jeff Walston

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Photo credit: © Z2A1 / Alamy / Afripics
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Keywords: .., air, defense, force, military, united, war