Air Force Tech. Sgt. Ken O’Brien, 68th Rescue Flight air operations instructor, practices a jumpmaster personnel inspection at Davis-Monthan Air Force Base, Ariz., May 19, 2017. Instructors must stay proficient in every component of the jump process in order to teach others in the Guardian Angel Formal Training Unit’s Military Freefall Jumpmaster Course.

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