The Radar Watch over Oak Ridge

On the night of 1 March 1950 Stuart E. Adcock, owner and operator of radio station WROL in Knoxville, rang the local FBI office. A radio ham, he had set up an army-surplus APN-7 radar in his home. It showed a "pip" circling at about 40,000 feet over Oak Ridge. The next morning he reported it again at about 100,000 feet. That evening Counter Intelligence Corps agent E. L. Seagraves and OSI agent W. M. Price sat at his screen and saw pips that Adcock said were the object. On 4 March he watched it stop circling and head east at about 200 miles per hour.

What is on the record

The papers are in the FBI's flying-disc file 62-HQ-83894 (Section 5), released by the Department of War on 8 May 2026. They include Army messages, FBI memos and teletypes, a long Knoxville office report and Hoover's letters of 14 March to the Atomic Energy Commission and the Justice Department. The Army's first message says the bearing and distance "put the object directly over Oak Ridge" and that no flight plan covered it.

The checks went against him. A Naval Reserve radar at Knoxville searched alongside and found nothing, though its crew said it was not built for such heights. Colonel C. D. Gasser and Captain Robert Cross of the Air Force's NEPA project at Oak Ridge examined the set. They found Adcock "technically incorrect" on radar theory and his equipment "haphazard at best". The Knoxville teletype adds: "RELIABILITY OF ADCOCK QUESTIONED DUE TO SOME DEGREE OF INEBRIATION". Gasser had earlier called aircraft flight at 100,000 feet "highly improbable" but "absolutely possible from a scientific and engineering standpoint". From 6 March Adcock could not be found. The office concluded that nobody knew "just what was detected ... or, in fact, whether anything was detected", and called the episode a "dry run" in which no agency took charge.

Project Blue Book's own record for Knoxville, 1 to 3 March, reads "Probably ground returns from inversion" and puts the third report down to an aircraft.

Why it sits where it does

L4 · OFFICIAL RECORD — a released government record names who saw it. Adcock and the two agents who watched his screen are named. No independent testimony sits beside the file in the archive, and the tier measures sourcing rather than truth. What the set was showing is not resolved here.