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Capt. Marisa Whitaker, U.S. Air Force B-52 Stratofortress aircraft commander, 20th Expeditionary Bomb Squadron from Barksdale Air Force Base, Louisiana, performs preflight checks on her oxygen mask to ensure it is not leaking and the valves are working properly Aug. 22, 2015, at Andersen Air Force Base, Guam. Whitaker is part of an aircrew that was called upon to support ongoing operations in the Indo-Asia-Pacific region. (U.S. Air Force photo by Staff Sgt. Robert Hicks/Released)
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