Air Force Technical Sgt. Cory Irvin, 37th Training Support Squadron combat arms training and maintenance instructor, inserts a magazine into his M-4 rifle during the Air Education and Training Command’s Defender Challenge team selection July 23, 2018, at Joint Base San Antonio-Medina Annex, Texas. Defender Challenge is a Security Forces competition that pits teams against each other in realistic weapons, dismounted operations and relay challenge events.

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Photo credit: © Barney Low / Alamy / Afripics
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Keywords: aetc, air, america, archive, armed, army, challenge, command, defence, defender, education, force, forces, military, navy, reportage, security, service, serviceman, servicemen, sfs, soldier, states, training, united, usa