U.S. Air Force 1st Lt. Roed Mejia, 731st Air Mobility Squadron passenger services flight commander, prepares to direct an incoming Korean Air Boeing 777 aircraft during a Mutual Airlift Support Agreement (MASA) exercise at Osan Air Base, Republic of Korea, May 4, 2018. The MASA demonstrates the alliance between the United States and ROK, which enabled the 731st AMS to process passengers and load personnel baggage onto a Korean commercial aircraft. (U.S. Air Force photo by Tech. Sgt. Ashley Tyler)