A U.S. Air Force combat control Airman from the 320th Special Tactics Squadron fires a 40 mm grenade launcher during a training exercise March 10, 2017, at the Irisuna Jima Training Range, Okinawa, Japan. The Airman joined a joint training exercise with U.S. Marines from the III Marine Expeditionary Force to pursue advanced JTAC qualifications. Smoke grenades are used as a visual marker for friendly aircraft. (U.S. Air Force photo by Senior Airman John Linzmeier)
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