U.S. Air Force Staff Sgt. Justin Goeppinger, 644th Combat Communication Squadron expeditionary communications specialist, uses a communications system to contact members from the 644th CBCS on Andersen Air Force Base, Guam, at Tinian, Nov. 14, 2023. Knight Call field training exercise is a joint effort between the 644th CBCS and Helicopter Sea Combat Squadron 25, to implement new communications methods for search and rescue operations, practice tactical Agile Combat Employment and Expeditionary Advanced Base Operations methods. (U.S. Air Force photo by Airman Allon Lapaix)