Firefighters from the 51st Civil Engineer Squadron drag a simulated wounded Airman to the treatment area during a simulated mass casualty exercise May 12, 2015, at Osan Air Base, Republic of Korea. First responders were required to wear their Mission Oriented Protective Posture gear while moving the simulated victims during the readiness exercise Beverly Midnight 15-02. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)

An M115A1 Ground Burst Simulator grenade explodes starting a mass causality exercise May 12, 2015, at Osan Air Base, Republic of Korea. This scenario was part of the readiness exercise Beverly Midnight 15-02. Beverly Midnight tests Osan’s wartime procedures, and realistically looks at our ability to defend the base, execute operations and receive follow-on forces. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)

Red smoke from an M18 Smoke Grenade clouds the air in front of the fitness center May 12, 2015, at Osan Air Base, Republic of Korea. The smoke signified the start of a mass causality exercise as part of the readiness exercise Beverly Midnight 15-02. The exercise helps identify areas where procedures should be changed or equipment added in order to enhance the emergency response capabilities. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)

First responders gather in front of the fitness center May 12, 2015, at Osan Air Base, Republic of Korea. Members of the Wing Inspection Team simulated a mass causality exercise as part of the readiness exercise Beverly Midnight 15-02. The readiness exercise was part of Team Osan's quarterly exercises which test the base's readiness. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)

A first responder from the 51st Security Forces Squadron writes the medical status on the forehead of a mass causality exercise victim May 12, 2015, at Osan Air Base, Republic of Korea. The Airmen are participating in the combat exercise Beverly Midnight 15-02. The exercise focuses on readiness, testing Osan’s wartime procedures, and realistically looking at our ability to defend the base, execute operations and receive follow-on forces. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)

First responders from the 51st Civil Engineer Suqadron arrive on the scene of a simulated mass casualty exercise May 12, 2015, at Osan Air Base, Republic of Korea. The scenario was part of the readiness exercise Beverly Midnight 15-02 and included coordination between multiple agencies across the base. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)

First responders from the 51st Civil Engineer Suqadron remove an exercise casualty during a simulated mass casualty exercise May 12, 2015, at Osan Air Base, Republic of Korea. The simulation was part of Beverly Midnight 15-02, a readiness exercise designed to test the capabilities of Team Osan. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)

A firefighter from the 51st Civil Engineer Squadron ground guides a fire engine during a simulated mass casualty exercise May 12, 2015, at Osan Air Base, Republic of Korea. Despite wearing their standard fire-protection gear and Mission Oriented Protective Posture gear, the Airmen worked throughout the night to get simulated victims the necessary medical care during the readiness exercise Beverly Midnight 15-02. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)

Medical first-responders from the 51st Medical Group prepare to lift a simulated victim into an ambulance during a simulated mass casualty exercise May 12, 2015, at Osan Air Base, Republic of Korea. Team Osan is participating in the combat exercise Beverly Midnight 15-02 which is designed to test American forces in the ROK on their mission readiness in the event of an emergency or wartime environment. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)

Airman 1st Class Harley Love-Hall, 51st Civil Engineer Squadron firefighter, prepares to put on his gas mask during a simulated mass casualty exercise May 12, 2015, at Osan Air Base, Republic of Korea. Members of Team Osan are participating in the combat exercise in order to focus on readiness, test Osan’s wartime procedures, and realistically look at our ability to defend the base, execute operations and receive follow-on forces. (U.S. Air Force photo by Staff Sgt. Benjamin Sutton/Released)