SrA Judah Wine, 606th Air Control Squadron radio frequency systems technician, explains blue sky mast set up and operations to Lt. Col. Brian Robertson, 606th ACS commander, at Pula Airport, Croatia, May 28, 2019. The 606th ACS deployed in support of exercise Astral Knight 2019. (U.S. Air Force photo by Staff Sgt. Tory Cusimano)