| Unit Name: | No. 654 Squadron AAC |
| Dates: | 15 July 1942 – 24 June 1947 (RAF) 1 September 1958 – July 2014 |
| Country: | United Kingdom |
| Branch: | Army Air Corps |
| Role: | Regimental Headquarters[1] |
| Command Structure: | 4 Regiment Army Air Corps |
| Garrison Label: | Base |
No. 654 Squadron AAC (654 Sqn) is a squadron of the British Army's Army Air Corps (AAC) that is currently the Headquarters Squadron for 4 Regt AAC. It was formerly No. 654 Squadron RAF, a unit of the Royal Air Force during the Second World War. Numbers 651 to 663 Squadrons of the RAF were air observation post units working closely with British Army units in artillery spotting and liaison. Their duties and squadron numbers were transferred to the Army with the formation of the Army Air Corps on 1 September 1957.
No. 654 Squadron was formed at RAF Old Sarum, Wiltshire, on 15 July 1942 and went into action in August 1943 in North Africa. From December 1943, it served in Italy, where it remained until disbanding at Campoformido on 24 June 1947.
No. 1906 Air Observation Post Flight was formed within 654 Squadron previously elements of 'A' & 'B' Flights along with No. 1907 Air Observation Post Flight which was formed within 654 Squadron previously elements of 'A' & 'C' Flights.
The squadron had the motto Progressive, it used a identification symbol of A propeller and gun barrel in saltire It used identification symbols: QA (1944 – May 1945, HQ Flight) QB (1944 – May 1945, 'A' Flight)QC (1944 – May 1945, 'B' Flight) QD (1944 – May 1945, 'C' Flight)
| July 1942 | September 1942 | Mk.II | ||
| September 1942 | December 1942 | Mk.I | ||
| December 1942 | October 1944 | Auster | Mk.III | |
| June 1944 | June 1947 | Auster | Mk.IV | |
| December 1944 | June 1947 | Auster | Mk.V |
The squadron was formed on 1 September 1958 in Germany and employed as 2 Division Aviation HQ between 1964 and October 1969.
Between February and March 1991 the squadron was in Iraq as part of Operation Desert Sabre (the ground phase of Operation Granby) using Westland Lynx AH1GT's against armoured vehicles of the Iraqi 12th Armoured Division. They returned to Hobart Barracks on 22 March 1991 without any losses.
654 AAC disbanded in July 2014, as part of Army 2020.[2]
At some point the squadron was reformed and became the Headquarters Squadron for 4 Regiment Army Air Corps.