21 Squadron
| Dates | Location | Higher Formation / Notes |
| 21 Field Park Squadron | ||
| 1948.07 | Germany: Iserlohn | |
| 1949.01 | Germany: Hameln | 23 Field Engineer Regiment |
| 1950.07 | Germany: Napier Bks, Dortmund | 23 Field Engineer Regiment |
| 1954 | 1954: Became an Independent Sqn, under local comd 23 Regt | Independent: local comd 23 Regt |
| May 58: 23 Regt disbanded | ||
| 1958: Amalgamated with 1254 and 1255 Sqns at Willich and renamed 21 Workshop and Park Squadron | ||
| 1958.07 | Germany: Kitchener Barracks, Willich | 40 Advanced Engineer Stores Regiment |
| Jan 68: Renamed 21 Park Squadron | ||
| 1970: Renamed 21 Army Support Squadron | ||
| April to Aug 76 or 77: Northern Ireland | ||
| Oct 77: 40 Regt disbanded and Sqn took over role of Engr Support in BAOR | Independent | |
| Oct 81: Disbanded | ||
| 1982: became 21 EBW | ||
| 21 EOD Squadron | ||
| 1991.03 | England: Lodgehill Camp, Chatham | Formed: 33 EOD Regiment |
| May - Sep 91: Kuwait | Force Maintenance Area | |
| 1993: Renamed 21 Field Squadron (EOD) | ||
| Apr - 6 Aug 95: Angola: Lobito: OP CHANTRESS | EOD Sp to BRITLOGBAT | |
| 13 Apr - 15 Jun 95: Cyprus: OP UPRAISE 1 | ||
| Op Grapple | ||
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