Tech Sgt. Christian San Juan, a native of Rohnert Park, Calif., assigned to the Nondestructive Inspection section of the 477th Maintenance Unit, inspects a negative film of aircraft parts for structural defects at Joint Base Elmendorf-Richardson, Alaska, Jan. 10, 2017. Nondestructive inspection Airmen analyze wear metal content on engine lubricating oil and other fluids, as well as detect flaws such as cracks, voids and heat damage on aircraft parts utilizing various test equipment.

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Keywords: air, alaska, america, archive, armed, army, base, defence, elmendorf-richardson, force, forces, jber, joint, military, navy, nondestructive, reportage, service, serviceman, servicemen, soldier, states, united, usa