Airman 1st Class Eric Knierim of the 30th Security Forces Squadron at Vandenberg Air Force Base, California, takes a break from training at the United States Air Force Academy in Colorado, Sep. 5, 2018. Knierim is representing Air Force Space Command at the Air Force Defender Challenge competition.

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Size: 1195px × 1673px
Photo credit: © Bob Collet / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: air, america, archive, armed, army, defence, force, forces, military, navy, reportage, service, serviceman, servicemen, soldier, states, united, usa