Col. Robert Sylvester, 56th Mission Support Group commander, and Airman 1st Class Lendrena Dez, 56th MSG executive, pose for a photo during an Arbor Day celebration April 26, 2019, at Luke Air Force Base, Ariz. Trees filter the air and water, provide food for humans and wildlife, supply building materials and help prevent soil erosion and flooding. (U.S. Air Force photo by Airman 1st Class Zoie Cox)