Airman 1st Class Jonathan Lake, 113th Maintenance Squadron aerospace ground equipment apprentice, tightens a bolt on an air conditioning unit at Joint Base Andrews, Md., March 27, 2017. The D.C. Air National Guard has various missions including defending the National Capital Region, supporting the District and local communities during special security events and natural disasters, and maintaining a worldwide deployable fighter and support force. (U.S. Air Force photo by Airman 1st Class Gabrielle Spalding)