U.S. Air Force Staff Sgt. Jonathan McCullough, an 8th Operations Support Squadron aircrew flight equipment journeyman assigned to Kunsan Air Base, Republic of Korea, signs a service date on a strobe light, May 2, 2016, at Eielson Air Force Base, Alaska. Strobe lights are used to signal for rescue once the pilot has ejected and is awaiting extraction. (U.S. Air Force photo by Staff Sgt. Ashley Nicole Taylor/Released)