Lt. Col. Christopher Kennedy, 460th Space Communications Squadron commander, speaks during a tree-lighting ceremony Dec. 3, 2015, on Buckley Air Force Base, Colo. The ceremony takes place every year to honor Senior Airman Kristopher Mansfield, who was killed in a drunk driving accident in 2004. (U.S. Air Force photo by Airman 1st Class Gabrielle Spradling/Released)

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