# No. 666 Squadron AAC

No. 666 Squadron AAC (V) is a former squadron of the British Army's Army Air Corps (AAC). It was previously No. 666 Squadron RAF, a unit of the Royal Air Force during the Second World War and afterwards became a Royal Auxiliary Air Force (RAuxAF) squadron between 1 May 1949 and 10 March 1957.
No. 666 Squadron RAF was a Royal Air Force air observation post (AOP) squadron associated with the Canadian 1st Army and later part of the Royal Auxiliary Air Force. Numbers 651 to 663 Squadron of the RAF were air observation post units working closely with British Army units in artillery spotting and liaison. A further three of these squadrons, 664–666, were manned with Canadian personnel. Their duties and squadron numbers were transferred to the Army with the formation of the Army Air Corps on 1 September 1957

## History
### Royal Canadian Air Force

No. 666 Squadron RCAF was first formed on 5 March 1945 at RAF Andover as an air observation post (AOP) squadron associated with the Canadian 1st Army. After a period working together with the Canadian army and later with the occupation forces in Germany the squadron disbanded on 30 September 1946.

### Royal Auxiliary Air Force

As the number was not transferred to the Canadian authorities, it was revived post-war when the squadron was reformed as No. 666 (Scottish) Squadron RAuxAF, part of the RAuxAF on 1 May 1949 at Scone. Equipped with Auster AOP.6 aircraft, the squadron's headquarters was located at RAF Perth/Scone, with three detached flights, Nos. 1966, 1967 and 1968 Reserve AOP Flight RAF at respectively RAF Perth/Scone, RAF Renfrew (later RAF Abbotsinch) and RAF Turnhouse, before it was disbanded on 10 March 1957 by transferring to the Army Air Corps.
Aircraft operated by No. 666 Squadron RAuxAF :
| From | To | Aircraft | Version |
| June 1949 | November 1951 | Taylorcraft Auster | V |
| June 1949 | February 1957 | Auster | AOP.6 |
Bases and airfields used by No. 666 Squadron RAuxAF :
| From | To | Base | Remark |
| 1 May 1949 | 10 March 1957 | RAF Perth/Scone, Perth and Kinross, Scotland | No. 1966 Reserve AOP Flight RAuxAF |
| 1 May 1949 | 10 March 1957 | RAF Turnhouse, Edinburgh, Scotland | No. 1968 Reserve AOP Flight RAuxAF |
| 1 December 1951 | 5 December 1952 | RAF Renfrew, Renfrewshire, Scotland | No. 1967 Reserve AOP Flight RAuxAF |
| 5 December 1952 | 10 March 1957 | RAF Abbotsinch, Renfrewshire, Scotland | |

### Army Air Corps

666 Aviation Squadron was formed on 19 August 1969 at Coypool, Plymouth within 3 Division Aviation Regiment, Army Air Corps. On 1 January 1973, 3 Division Aviation Regiment was renamed to 3 Regiment Army Air Corps and 666 Aviation Squadron AAC became 666 Squadron AAC. On 1 January 1973 the squadron moved to Alanbrooke Barracks, Topcliffe to support 24th Airportable Brigade, however on 1 April 1978 the squadron was disbanded and became No. 655 Squadron AAC.
666 Squadron was reformed as 666 Squadron AAC (V) during 1979 at Airfield Camp, Netheravon within 7 Regiment Army Air Corps (V) operating Westland Gazelle AH.1's.
666 Squadron AAC (V) was reformed on 26 April 1986 at Netheravon with the Scout AH.1.
The squadron was disbanded on 1 April 2009, still at Netheravon.

## Fictional service

A fictional 666 Squadron featured in the Air Ace Picture Library story The Bomber Barons. This 666 Squadron was a bomber unit founded at the outbreak of World War II, operating Handley Page Hampdens (September 1939 – December 1940), Avro Manchesters (January 1941 – 1942), Avro Lancasters (1942–1944) and Avro Vulcans (1960s – 1982). In the long-running series of 'Biggles' books by W. E. Johns, 666 Squadron, RAF, is the Special Duties squadron led by the eponymous hero James Bigglesworth during World War II. In the Charles Stross novel "The Fuller Memorandum" 666 Squadron is a secret RAF unit involved on occult activities.