U.S. Air Force Master Sgt. Neal Scheuneman, Air Combat Command MQ-9 program manager, watches as his daughter, Charli Scheuneman, age 5, plants a tree during an Arbor Day event at Joint Base Langley-Eustis, Va., April 21, 2017. The trees were planted to help absorb carbon dioxide, which removes and stores the carbon while releasing the oxygen back into the air. (U.S. Air Force photo/Senior Airman Derek Seifert)