Airmen assigned to the 2nd Security Forces Squadron, perform an annual M4 carbine qualification at Barksdale Air Force Base, La., Jan. 31, 2018. The M4 uses mm ammunition and has an effective point target range of 500 meters and an effective area target range of 600 meters. ( Air Force

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