An explosive detection K-9 unit waits outside prior to the Multi-Agency K-9 Explosive Training Event at Thomas A. Edison High School in Alexandria, Va., Apr. 6, 2022. The event hosted MWDs from the Federal Bureau of Investigation, Department of Defense, multiple private organizations, police departments and other agencies for a total of more than 70 teams. (U.S. Air Force photo by Airman 1st Class Austin Pate)