In September 1950, detachments C, K, and N of Strategic Air Command's 3903rd Radar Bomb Scoring Squadron (later, Group) arrived from the United States at Pusan, South Korea. Their mission was to provide radar signals to guide night bomb and flare drops from tactical air support aircraft in Korea. Although the three detachments belonged to the Strategic Air Command, they were attached to the 502d Tactical Control Group. Using mobile equipment mounted on vans, two of the detachments (C and K) moved in November to Pyongyang, North Korea, where they directed bomb drops on enemy troop concentrations. After returning southward in the face of an enemy offensive, detachments C and K arrived at Taegu by January 1951 where they were joined by detachment N from Pusan. Detachments C, K, and N were redesignated respectively as detachments 11, 5, and 22, and each one was assigned to accompany a separate U. S. Army Corps. Their signals made bomb drops by bombers and fighter-bombers more accurate, enhancing USAF night close support missions. They also guided C-47s dropping flares for night illumination. In October 1951, the three detachments departed Korea, having transferred their radar functions to the 502nd Tactical Control Group.

Note: The 3903rd as a whole received no Korean campaign or service streamer, but individual detachments operating in Korea received campaign streamers and decorations.