664 Air Observation Post (AOP) Squadron Royal Air Force (RAF) was raised on 1 December 1944 as a Royal Canadian Air Force Squadron, at RAF Andover, Hampshire, under Major DR Ely. The Squadron deployed to Holland and moved forward with the advance into Germany in support of 2 Canadian Corps. In June 1945 the Squadron returned to Holland to act as a communications unit for 4 and 5 and later 3 Canadian Divisions, returning to Germany in September 1945. The Squadron was disbanded from Germany on 31 May 1946 and reformed as a Royal Auxiliary Air Force (RAuxAF) Squadron at RAF Hucknell, Nottinghamshire, in 1949. The Squadron title disappeared with the disbandment of all the RAuxAF in 1957. The Squadron became an Army Air Corps Squadron in 1969. 664 Squadron Army Air Corps provided direct support to 16 Parachute Brigade based at Farnborough and in 1971 and were retitled 664 Parachute Squadron Army Air Corps, located at RAF Aldergrove, Northern Ireland. This title remained until March 1978 when, with the reorganisation of the Army, the Squadron moved to Minden, Germany. 664 Sqn AAC remained in Minden, as part of 4 Regiment Army Air Corps until they returned to the United Kingdom in March 1992 as part of 9 Regiment Army Air Corps, providing and anti-tank capability for 16 Air Assault Brigade. In 2007 the Army Air Corps was restructured into single-type regiments and 664 Sqn AAC was redesignated as a 4 Regiment Army Corps Squadron. The Squadron converted to an Attack Helicopter (Apache) Squadron in July 2007.
Squadron motto - 'Vae viso' or 'I espied it; woe betide it'.
Squadron badge heraldry - An archer kneeling in a sinister position, his bow fully drawn.