Air Force Staff Sgt. Jason Perkins, 20th Security Forces Squadron (SFS) unit trainer, performs a push-up wearing a weighted uniform during the 20th SFS Combat Challenge at Shaw Air Force Base, , March 24, 2017. The obstacle courses consisted of a 45-pound ruck march, chemical warfare memory games and many other challenges, each focusing on different aspects of a 20th SFS Airman, or defender’s, career.

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Size: 1734px × 1154px
Photo credit: © Chuck Little / Alamy / Afripics
License: Licensed
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