Airmen don their gas masks during a chemical, biological, radiological or nuclear attack training exercise at Davis-Monthan Air Force Base, Ariz., Feb. 11, 2018. The CBRN exercise tested the readiness of Airmen in a simulated deployed location. ( Air Force

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Keywords: -, air, america, armed, army, base, cbrn, davis-monthan, defence, employee, exercise, federal, force, forces, gear, government, military, mopp, navy, readiness, service, serviceman, servicemen, states, united, usa