Royal Air Force Wing Cmdr. Philip Holdcroft, standing, Ninth Air Force J3 Operations Directorate exchange officer, briefs U.S. Air Force Gen. Mike Holmes, commander of Air Combat Command, Maj. Gen. Scott J. Zobrist, Ninth AF commander, and staff during Mission Readiness Exercise (MRX) 19-2, Shaw Air Force Base, S.C., Dec. 13, 2018. MRX 19-2 was an initial operational certification event designed to demonstrate Ninth Air Force’s ability to effectively plan, prepare, execute and assess Combined Joint Task Force operations at the operational level of war as tasked by the Air Force Chief of Staff. (U.S. Air Force photo by Tech. Sgt. Amanda Dick)