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

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Keywords: 434, 434arw, 434th, air, america, arb, armed, arw, base, defence, employee, federal, forces, government, grissom, military, oss, refueling, reserve, service, states, united, usa, wing