A cordon with M9 paper, which detects chemical contaminates, is placed near the flightline during exercise Rock I, Feb. 21, 2018 at Little Rock Air Force Base, Ark. The cordon was one of many tools used during the exercise to train personnel in measures taken during a contingency operation. ( Air Force

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Keywords: air, america, armed, army, defence, employee, federal, force, forces, government, military, navy, service, serviceman, servicemen, states, united, usa