Air Force Airman 1st Class Logan Linkous, 20th Security Forces Squadron entry controller, performs a four-man push-up with three other teammates at Shaw Air Force Base, , Oct. 8, 2014. The four-man push-up was part of the Defenders Edge Challenge in which 20th SFS Airmen completed obstacles that tested their physical fitness, mental, and shooting abilities. Senior Airman Tabatha Zarrella

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Photo credit: © Z2A1 / Alamy / Afripics
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Keywords: .., 20th, air, challenge, defenders, defense, edge, force, military, sfs, united, war