1980 Bentwaters Woodbridge UFO incident

From Ikwipedia

Either objects were present over nuclear weapons storage ateas at Bentwaters that could not be identified nor prevented.

Or, Colonel Halt, the commander, was a liar and a lunatic, as were all the witnesses.

That he was promoted to command a nuclear missile wing after he escalated the incident to the MoD by reporting it shows it did not affect his career one bit.