4 Regiment Army Air Corps consists of two Squadrons:
- 656 Squadron Army Air Corps
- 664 Squadron Army Air Corps
4th Division Aviation Regiment formed up on 24 October 1969 from 654 Aviation Squadron located at Herford, 661 Aviation Squadron located at Detmold and 662 Aviation Squadron located at Munster. In 1972, 662 Aviation Squadron moved to 2nd Division Aviation Regiment and 660 Aviation Squadron was placed under command of 4th Division Aviation Regiment. On 1 January 1973 the Regiment was re-titled 4 Regiment Army Air Corps and the Squadrons remained in their designated locations until November 1977. Following a restructure the Regiment now consisted of a Regimental Headquarters, 661 Squadron Army Air Corps (A Squadron) at Detmold and 658 Squadron Army Air Corps (B Squadron) at Minden. In 1978, following the Wide Horizon Study the Squadrons were redesignated with 654 Squadron Army Air Corps at Detmold and 664 Squadron Army Air Corps at Minden.
During the period 1978-1983 the Lynx AH Mk1 aircraft replaced the Scout, initially in the light utility role until the TOW (tube-launched, optically tracked, wire-guided) anti-tank missile system capability was operational. In January 1983, as a result of the restructuring of the British Army of the Rhine, 664 Squadron Army Air Corps became independent, remaining at Minden as the Corps Support Squadron. 659 Squadron Army Air Corps and 669 Squadron Army Air Corps joined the Regiment following the disbandment of 9 Regiment Army Air Corps.
As of 1 October 1986, 4 Regiment Army Air Corps consisted of a Headquarters Squadron, 654 Squadron Army Air Corps, 659 Squadron Army Air Corps and 669 Squadron Army Air Corps. The Regiment was equipped with the Gazelle and Lynx aircraft supported by 4 Regiment Army Air Corps Workshops Royal Electrical and Mechanical Engineers. 4 Regiment Army Air Corps was active on Operation GRANBY (Iraq 1990-1991) as the Divisional Aviation Regiment before relocating to Wattisham in 1995 and re-roled as an aviation regiment in support of 24 Airmobile Brigade. (On 1 September 1999, 24 Airmobile Brigade became 16 Air Assault Brigade prior to the introduction of the Apache attack helicopter.) 659 Squadron Army Air Corps was re-equipped solely with the Lynx Mk9 (wheeled undercarriage) light battlefield helicopter whilst the other two flying squadrons retained their anti-tank role.
During 2007, 659 Squadron Army Air Corps and 669 Squadron Army Air Corps relocated to Dishforth to become part of 9 Regiment Army Air Corps. As part of this re-organisation 664 Squadron Army Air Corps and 656 Squadron Army Air Corps (from 9 Regiment Army Air Corps) moved to Wattisham in the same year. 9 Regiment Army Air Corps, was formally disbanded in 2016 and officially removed from the Army ORBAT 31 Jul 16.
654 Squadron was disbanded in 2015.