21st (Training) Wing RFC was formed on 9 August 1916 at Filton Aerodrome, it moved to Circenster Castle on 2 September 1916 and was transferred to Southern Group Command on 10 January 1917.

The wing was then transferred to Southern Training Brigade on 5 September 1917 and to Western Group Command on 8 November 1917.

[1] It controlled various bases such as: Beaulieu, Bicester, Filton, Ford Junction, Lilbourne, Port Meadow, Rendcombe, Weston-on-the-Green, Witney & Yatesbury.

141 Wing RAF and moved to St Laurent on 6 June 1944, then to Longeville, Chateau Tocqueville, Utah Beach, Southampton and finally RAF Ibsley on 28 July 1944 where it was disbanded on 10 November 1944.

21 (Surface to Air Missile) Wing RAF on 1 June 1961 with 94, 112 and 247 Squadrons.