A tree is lit Dec. 9, 2013, on Buckley Air Force Base, Colo., during a tree-lighting ceremony in memory of Kristopher Mansfield, a former 460th Space Communications Squadron Airman who was killed by a drunk driver. Family and friends decorate the tree in celebration of Mansfield’s life and what he meant to the squadron. (U.S. Air Force photo by Airman 1st Class Samantha Saulsbury/Released)