U.S. Capt. John Walton, 2016 Air Force Research Laboratory Commanders Challenge program execution officer, walks across the test range between scenarios at the Nevada National Security Site, Las Vegas, NV., Dec. 13, 2016. The challenge consisted of six teams who were given six-months to develop a complete counter unmanned aerial system to aid in base defense. (U.S. Air Force photo by Wesley Farnsworth)
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