What happened
USAF security police investigated lights in the forest on Dec 26; on Dec 28 Lt. Col. Charles Halt led a patrol and recorded 18 minutes of audio in real time.
The record on unidentified anomalous phenomena
When the lights came back, the deputy base commander walked into the forest with a Geiger counter and a running microcassette recorder. Eighteen minutes survive. You hear them in this episode.
USAF security police investigated lights in the forest on Dec 26; on Dec 28 Lt. Col. Charles Halt led a patrol and recorded 18 minutes of audio in real time.
Multiple USAF security police (Penniston, Burroughs, Cabansag); Deputy Base Cmdr. Lt. Col. Charles Halt on tape.
Halt's memo to the UK MoD ("Unexplained Lights", Jan 13, 1981, released 1983) — never retracted — and the tape itself, a U.S. government recording in the public domain.
MoD: "no defence significance." The memo stands; the tape is undisputed.