Airmen volunteer at a tree-planting ceremony in celebration of Earth Week and Arbor Day at Joint Base Andrews, Md., April 18, 2017. During the ceremony, Col. E. John Teichert, 11th Wing and JBA commander, received awards from the Maryland Department of Natural Resources for the base’s continuing contributions to environmental services. (U.S. Air Force photo by Senior Airman Mariah Haddenham)