RAF Bentwaters Security Team Ground Traces 1980
Follow-up physical evidence investigation at Rendlesham Forest by USAF Deputy Base Commander Lt. Col. Charles Halt over three nights. Halt's cassette tape recording made in real time documents radiation readings at ground traces and a craft performing maneuvers over the weapons storage area. Halt filed a memo to the Ministry of Defence, later released under the UK's Freedom of Information Act. Sergeant Penniston's notebook described binary codes he copied from symbols on the craft.