Col. Sean Boyle, 90th Mission Support Group commander, Lt. Col. Charles Roberts and 2nd Lt. Caleb Bury, both from 90th Civil Engineer Squadron, and Mark Ellison, Wyoming State Forestry, plant a tree here June 3 for Arbor Day. Mr. Ellison presented Warren with a Tree City USA award for planting a tree on base every year for the last 23 years. (U.S. Air Force photo by Blaze Lipowski)