45 Squadron
| Dates | Location | Higher Formation / Notes |
| 45 Field Park Squadron | ||
| 1948.03 | Germany: | Formed by re-titling 145 Fd Pk Coy. |
| 1948: Almost immediately disbanded | ||
| 45 Field Park Squadron | ||
| 1949.07 | Germany: Holzminden | Reformed 21 Field Engineer Regiment |
| 1949.10 | Germany: Hameln | 21 Field Engineer Regiment |
| 1951.11 | Germany: Assaye Barracks, Nienburg | 21 Field Engineer Regiment |
| Jan 58: 21 Field Engineer Regiment disbanded. Sqn came under command 5 Div Engineers | 5 Div Engineers | |
| July 60: 5 Div Engrs renamed 1 Div Engrs (5 Division renamed 1 Division) | 1 Div Engineers | |
| Jan 68: Renamed 45 Field Support Squadron | ||
| Apr 69: 1 Div Engineers reformed as 21 Engineer Regiment | 21 Engineer Regiment | |
| 30 Apr - 5 Aug 71: Northern Ireland Tour: Long Kesh | 21 Engineer Regiment Infantry role |
|
| 15 Dec 74 - 11 Apr 75: Northern Ireland Tour: Long Kesh | 21 Engineer Regiment Infantry role |
|
| Apr 78: 21 Regiment renamed 1 Armoured Division Engineer Regiment | 1 Armd Div Engr Regiment | |
| Jul - Nov 79: Northern Ireland Tour: Maze Prison Guard Force | ||
| Jan 81: 1 Armoured Division Engineer Regt renamed 21 Engineer Regt | 21 Engineer Regiment | |
| 1984: Moved to 1 Armd Division | 1 Armd Division | |
| 1991: Gulf War | ||
| Jun - Nov 95: Ploce, Bosnia: Op Grapple Surge | 35 Engineer Regiment | |
| 1996.02 | Germany: Quebec Barracks, Osnabruck | 21 Engineer Regiment |
| 1999.12.01 | Germany: Gordon Bks, Hameln | 28 Engineer Regiment |
| Feb – Sep 00: Op AGRICOLA | 28 Engineer Regiment | |
| Jun – Nov 01: Afghanistan - Op FINGAL | 28 Engineer Regiment | |
| Dec 03 – Apr 04: Iraq - Op TELIC 5 | 28 Engineer Regiment | |
| cAug 08 - | Germany: Gordon Bks, Hameln | 28 Engineer Regiment |
| Oct 09 - Apr 10: Afghanistan: Op Herrick 11 | ||
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