U.S. Army Capt. Craig Osbeck, 5th Battlefield Coordination Detachment, ground liaison officer(center), briefs aircrew members assigned to the 20th Expeditionary Bomb Squadron, on a tactical battlefield scenario before an Enhanced Air Cooperation (EAC) sortie at Royal Australian Air Force Base, Darwin, Australia, April 5, 2018. Osbeck provides guidance and advice on ground combat capabilities and requirements in support of effective air-ground combat synchronization. The week-long EAC 18-2 is designed to improve interoperability between U.S. Air Force aircrews and Australian joint tactical air controllers during close air support operations. (U.S. Air Force photo by Staff Sgt. Alexander W. Riedel)