Col. Ronald Allen, 90th Missile Wing vice commander, Airmen from F.E. Warren Air Force Base, Wyo., and members from the Cheyenne, Wyo., community work together to plant a tree June 24, 2015, on F.E. Warren Air Force Base, Wyo. This was the 27th consecutive year Warren participated in the Tree City USA program. (U.S. Air Force photo by Airmen 1st Class Malcolm Mayfield)