Airmen from the base honor guard at Grand Forks Air Force Base, N.D., do situps during a group physical training session Oct. 19, 2012, at the base fitness center. The Air Force has released further guidance on the implementation of several changes to the physical assessment test, which will take place Oct. 21, 2013. (U.S. Air Force photo/Staff Sgt. Luis Loza Gutierrez)
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