MARINE CORPS AIR STATION YUMA, Ariz. -- Marines work to deescalate a hostage situation during Exercise Desert Fire 2021 at the Naval Branch Health Clinic on Marine Corps Air Station Yuma, Ariz., July 28, 2021. Desert Fire is an active-shooter drill implemented to test, evaluate and improve the response and preparedness of first responders on the air station. (U.S. Marine Corps photo by Lance Cpl. Gabrielle Sanders)