A radio-controlled, ultra-light aircraft flies over a training area Feb. 27, 2018, on the Redstone Arsenal in Huntsville, Alabama, as part of the Kirtland Air Force Base entry in the 2017 Air Force Research Laboratory Commander’s Challenge. The ultra-light carried a crate containing an autonomous vehicle with supplies, which was dropped by parachute with the hope it would be able to make its own way to a rendezvous point. (U.S. Air Force photo by R.J. Oriez)