21 Regiment
| Dates | Locations & Titles | Minor Units - Remarks |
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| . | 12th Air Formation Signals | . |
| 1943 | Kirkburton, England | Formed |
| 1944/45 | Normandy to Bad Eilsen | With 2 TAF |
| 1945 | Germany: Bad Eilsen and Buckeburg | . |
| . | 1946: Absorbed into 11th Air Formation Signals | . |
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| . | 83 Group Air Formation Signal Squadron | . |
| 1952 | Germany: Formed at Wahn, from One sqn of 11th Air Formation Signals | 83 Group RAF |
| . | 1954: Expanded to become 83 Group (12) Air Formation Signal Regiment | . |
| . | 1958: 83 Group disbanded | . |
| 1958.07.15 | Germany: RAF Laarbuch: RHQ and 1 Squadron | . |
| . | 1958: Renamed 12th Air Formation Signal Regiment | . |
| . | 1959: Redesignated 21st Signal Regiment (Air Formation) | BFPO 43 |
| . | 23 Oct 1959: Regimental Organisation: RHQ Laarbruch, 2 Wing Signal Troop Laarbruch, 19 Wing Signal Troop Wildenrath, 20 Wing Signal Troop Geilenkirchen and 21 Wing Signal Troop Bruggen | . |
| . | 28 Mar 1960: Re-designated Airfield Troops L-K-G-H, 221 Signal Squadron (AF) Rheindalen absorbed into the Regiment. 21 Signal Regiment (AF) became the only Air Formation Signals Unit in existence | . |
| . | 1961: 220 Signal Squadron joined regiment | . |
| . | 22 Nov 1961: 3 Squadron was formed from 220 & 221 Sqns and incorporated into the Regiment | . |
| . | 1 Apr 1968: RAF Geilenkirchen closed , G Troop disbanded | . |
| 1970.07.28 | Germany: RAF Wildenrath | . |
| . | 1971 July: Title changed to read 21 Signal Regiment (Air Support) | . |
| . | 6 May 1983: RAF detachment Osnabruck officially took up residence, 19th August joined by 2 Squadron | . |
| . | 1984 22nd May The Regiment celebrated 25 years of continuous Air Support, the Regiment was honoured by being allowed to to fly The RAF crest on itâÂÂs Regimental Flag | . |
| . | 31 Mar 1987: A welcome home parade was held as the Osnabruck det was closed and the Regiment was re-united in Wildenrath, RHQ 1-2-3 & 4 Squadrons | 1, 2, 3 & 4 Squadrons |
| . | 15 May 1992: 2 Squadron (Harrier Squadron) was disbanded | 1, 3 & 4 Squadrons |
| Summer 1992 | England: Azimghur Barracks, Colerne: 4 Squadron amalgamated with 244 Signals Squadron, 1 Squadron changed itâÂÂs title to 2 Squadron and joined 2 Signal Regiment | 3 and 244 Sqns |
| . | 1 Sep 1992: 43 ( Wessex ) Signal Squadron (V) and 81 Signals Squadron (V) joined the Regiment | 3, 244, 43(Wessex)(V) and 81(V) Sqns |
| . | 5 Jan 1993: 3 Squadron changed it'ÂÂs title to 220 Squadron | 220, 244, 43(Wessex)(V) and 81(V) Sqns |
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