the fall of the Berlin Wall, Chipmunk reconnaissance flights soon ceased and the two Chipmunks were flown to RAF Laarbruch, in Western Germany to await disposal action. Chipmunk WG466 was flown back to Berlin Tempelhof from RAF Laarbruch on 30 July 1994 and was donated to the Alliiertenmuseum in Berlin. It is currently on loan to the Luftwaffenmuseum der Bundeswehr at Gatow, WG486 is still in RAF service with the Battle of Britain Memorial Flight. RAF Gatow was from 1970 also used by the UK's Army Air Corps, 7 Aviation Flight AAC, later renamed No. 7 Flight AAC being based at the station initially flying four Westland Sioux (UK-built Bell 47) and later three Westland Gazelle AH.1 helicopters. A Signals Unit (26SU) was also based at RAF Gatow and on the Teufelsberg in the Grunewald. 26SU was a specialist Signals Intelligence unit operated by the RAF on behalf of GCHQ Cheltenham tasked with monitoring Warsaw Pact military communications over East Germany and Poland. Escapes to Gatow from East Germany At least three successful escapes were made from East Germany to RAF Gatow. On 7 April 1978 two East German brothers defected by flying a Zlin Z-42M light aircraft of the Gesellschaft für Sport und Technik (GST – an East German paramilitary training organisation) to RAF Gatow. The escape had been planned over the previous three years. The aircraft was dismantled and returned to East Germany with painted slogans such as "Wish you were here". On 24 June 1979 an East German glider landed at RAF Gatow, its pilot seeking political asylum. The glider was handed back to East Germany at the Glienicke Bridge four days later. The flying control surface lock for the rudder bore the message "remove before the next escape". On 15 July 1987, a young East German, Thomas Krüger, defected by flying a Zlin Z-42M light aircraft of the Gesellschaft für Sport und Technik. His first words to the RAF Police were a request for political asylum. He was handed over to the civil authorities and received West German citizenship. His aircraft, registration DDR-WOH, was dismantled and returned to the East Germans (by road) by RAF station flight personnel, complete with humorous slogans painted on by RAF airmen such as "Wish you were here", "Come back soon". DDR-WOH is still flying today, but since 1991 under registration D-EWOH. East German invasion plans The closest military neighbour to