U.S. Air Force 1st Lt. Maria Reffner, flight commander at the Installation Office of Emergency Management, 316th Civil Engineer Squadron, waits for the signal to enter a building during a Chemical, Biological, Radiological, and Nuclear training exercise at Joint Base Andrews, Md., Aug. 23, 2024. The exercise involved precision timing and communication, critical for ensuring safe entry into potentially hazardous areas. (U.S. Air Force photo by Staff Sgt. Isaac March)