4 Squadron
| 4 Field Squadron | ||
| Dates | Location | Higher Formation / Notes |
| 1949 | Germany: Holzminden | 21 Field Engineer Regiment |
| 1949.10 | Germany: Hameln | 21 Field Engineer Regiment |
| 1951.11 | Germany: Assaye Barracks, Neinburg | 21 Field Engineer Regiment |
| Sep 57: Assaye Barracks, Neinburg | HQRE 7 Div Supporting 7 Armd Bde |
|
| 1958.01 | Germany: Fallingbostel | HQRE 7 Div Supporting 7 Armd Bde |
| Apr 58: HQRE 7 Div renamed HQRE 5 Div | HQRE 5 Div Supporting 7 Armd Bde |
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| Jul 60: HQRE 5 Div renamed 1 Div Engineers | 1 Div Engineers Supporting 7 Armd Bde |
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| 1962.01 | Germany: Assaye Barracks, Neinburg | 1 Div Engineers |
| Apr 69: 1 Div Engineers renamed 21 Engineer Regiment | 21 Engineer Regiment | |
| 30 Apr - 5 Aug 71: Northern Ireland Tour: Long Kesh | 21 Engineer Regiment Infantry role |
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| 4 Jul - 7 Nov 73: Northern Ireland Tour: Ballykelly | ||
| 15 Dec 74 - 11 Apr 75: Northern Ireland Tour: Kitchen Hill Factory, Lurgan | 21 Engineer Regiment Infantry role |
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| 25 Sep - 29 Dec 76: Northern Ireland Tour: Londonderry | 21 Engineer Regiment Infantry role |
|
| Apr 78: 21 Engineer Regiment renamed 1 Armd Div Engr Regiment | 1 Armd Div Engr Regiment | |
| Apr - Jul 79: Northern Ireland Tour: Lurgan/HMP Maze/Portadown | 1 Armd Div Engr Regiment Infantry role |
|
| Jan 81: 1 Armd Div Engr Regiment renamed 21 Engineer Regiment | 21 Engineer Regiment | |
| 1st Gulf War | 21 Engineer Regiment in Close Sp Orbat (? x Tank Bridges AVLB/AVRE). |
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| 1 Jun 93 - 22 Nov 93: Belize | ||
| Sep 95 - ??: Bosnia, formed part of Task Force Alpha, part of UN Multi-National Brigade | 21 Engineer Regiment | |
| 1996 | Germany: Quebec Barracks, Osnabruck | 21 Engineer Regiment |
| Op Grapple | ||
| Feb 00: Renamed 4 Armoured Engineer Squadron | ||
| Mar 00 - ??: Bosnia, Operation Palatine | ||
| 2008.08 | England: Catterick | 21 Engineer Regiment |
| Apr - Oct 10: Afghanistan: Op Herrick 12 | ||
| Oct 12 – Apr 13: Afghanistan: Op Herrick 17 | ||
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