A retired US Air Force officer claims he had a close encounter in a British forest nearly four decades ago.

Steve Longero revealed Monday that he was a witness to the infamous 1980 Rendlesham Forest incident in Suffolk, England — dubbed “Britain’s Roswell” — where military personnel claimed they saw a UFO during a stretch of three spacey December nights.

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“I think it was something not from this world,” Longero told The Sun. He was on duty Dec. 26, 1980, the first night sightings were reported.

“We had a very sophisticated alarm system and everything just went off,” he recalled. Longero continued: “It was real kind of quiet and this thing hovering over the trees, and you were like kind of tracking …