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U.S. Air Force Staff Sgt. Cydney Brown, 6th Airlift Squadron does sit-ups during the Chief’s Group push-up and sit-up challenge at Travis Air Force Base, Calif., Feb. 23, 2017. The event’s purpose was to raise money to support Travis Airmen by getting pledges and donations. (U.S. Air Force photo/Louis Briscese)

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