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Anthony Callaham, Team Kirtland team member, works to repair a broken servo on his team’s radio-controlled, ultra-light aircraft Feb. 27, 2018, prior to Kirtland’s 2017 Air Force Research Laboratory Commander’s Challenge demonstration at the Redstone Arsenal in Huntsville, Alabama. Kirtland’s concept to meet the challenge of resupplying isolated, forward-deployed troops was to drop a small, autonomous vehicle loaded with supplies that would then be able its own way to a rendezvous point. (U.S. Air Force photo by R.J. Oriez)