Senior Airman Justin Branch, 434th Operations Support Squadron Aircrew Flight Equipment Apprentice, runs a diagnostic on a mask at Grissom Air Reserve Base, Ind., September 23, 2017. Diagnostics are ran regularly on these masks to ensure function and safety. ( Air Force photo/ Senior Airman Cali Wetli)

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Size: 1848px × 2784px
Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 434, 434arw, 434th, air, arb, arw, base, grissom, oss, refueling, reserve, wing