He says he now has statements from radar operators at RAF Bentwaters and nearby Wattisham airfield that an unknown object was tracked at the time.
Col Halt claimed it was seen by himself and base security staff.
The 75-year-old, who was deputy commander at the Bentwaters base and now lives in the US state of Virginia, said some former service people had not wanted to speak until they retired but had now provided written statements to him.
The Ministry of Defence told the BBC it no longer deals with reports of UFOs.
Rendlesham Forest UFO mystery: who, what, where?
- United States Air Force security personnel John Burroughs and Jim Penniston were the first to report sightings of strange lights on 26 December 1980
- Col Halt recorded a running commentary into a dictation device of their efforts to find the source of the lights
- RAF Bentwaters was an airbase used by the United States Air Force during the Cold War until 1993
- Other suggestions as to what was seen at Rendlesham include military project testing, a helicopter carrying a dummy Apollo capsule, light from the Orford Ness lighthouse and pranks by airmen
- In 1983, the News of the World ran a front page story which proclaimed: "UFO LANDS IN SUFFOLK, And that's OFFICIAL"
"At Wattisham, they picked up what they called a 'bogie' and lost it near Rendlesham Forest.
"Whatever was there was clearly under intelligent control."
UFO researcher John Hanson said he found Col Halt to be a reliable witness and there had been a "concerted effort to hide the truth".
He said the evidence of the UFO being picked up by radar seriously undermined the suggestion by the government at the time that the reported phenomena was due to witnesses seeing the light from Orfordness lighthouse and misinterpreting what they saw.