U.S. Air Force Col. David Stanfield, 633rd Mission Support Group commander, helps students at the Child Development Center plant trees during an Arbor Day event at Joint Base Langley-Eustis, Va., April 21, 2017. Trees benefit the earth by providing cleaner air, lowering energy costs, improving water quality, storm water control and increased property values. (U.S. Air Force photo/Senior Airman Derek Seifert)