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SAN MARCOS, Guatemala – New Hampshire National Guard Sgt. John Cooney, 238th Aviation Regiment UH-60 Black Hawk utility helicopter crew chief, places chalks in front of the wheel of a UH-60 after landing on a cargo transport mission May 27, 2016, during Exercise BEYOND THE HORIZON 2016 GUATEMALA. The chalks are used to prevent the aircraft from rolling while on the aircraft ramp. ( Air Force photo by Senior Airman Dillon Davis/Released)
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