73 Squadron
| Dates | Location | Higher Formation / Notes |
| 73 Field Squadron | ||
| 1949 | Wales: Cwrt-y-Gollen Camp, Crickhowell | Formed: 37 Army Engineer Regiment |
| 1950 renumbered 40 Field Squadron | ||
| 73 Field Squadron | ||
| 1951 | Wales: Cwrt-y-Gollen Camp, Crickhowell | Reformed: 39 Army Engineer Regiment |
| 1953 | England: Ripon | 39 Army Engineer Regiment |
| 1953.10 | Kenya | 39 Army Engineer Regiment |
| Nov 55: Kenya | Independent | |
| 1956 | Bahrain | |
| 1957 | UK | |
| Mar 1957: Disbanded | ||
| 73 E & M Squadron | ||
| 1957.08 | UK | Reformed |
| 1957.12 | Christmas Island | Independent? |
| Dec 57: Renamed 73 (Christmas Island) Squadron | ||
| 1964.07 | England: Ripon | 38 Engineer Regiment |
| Jul 64: Renamed 73 Field Squadron | ||
| 1965 - 1966: Aden | ||
| Sep 69 - Feb 70: Sharjah, Masirah, Manama and Bahrain | ||
| Feb 1970: became 11 Field Squadron | ||
| 73 Amphibious Engineer Squadron | ||
| 1971.01 | Bindon Barracks, Hameln | Reformed: 28 Amphibious Engineer |
| 8 Jun - 8 Nov 74: Northern Ireland Tour: Londonderry | under command 26 Eng Regt - Infantry role | |
| 9 Mar - 30 Jun 76: Northern Ireland Tour: Londonderry | under command 32 Eng Regt - Infantry role | |
| 1976.07 | Quebec Bks, Osnabruck | under local command 23 Regt |
| Sep 76: Renamed 73 Independant Field Squadron | Independent - supporting 5 Field Force | |
| 25 Oct 77 - 22 Feb 78: Northern Ireland Tour: Ballykelly | ||
| 23 Oct 79 - 23 Feb 80: Northern Ireland Tour: Ballykelly | ||
| Jan 83: Renamed 73 Field Squadron, joined 23 Eng Regt | 23 Engineer Regiment | |
| Oct 83 - Apr 84: Falkland Islands | 37 Engineer Regiment | |
| Dec 90 - Mar 91: Middle East - Op Granby | 23 Engineer Regiment | |
| 1993: Disbanded | ||
| 73 Armoured Engineer Squadron | ||
| 2000.11 | Quebec Bks, Osnabruck | Reformed: 21 Engineer Regiment |
| 2008.08 | England: Catterick | |
| Apr - Oct 10: Afghanistan: Op Herrick 12 | ||
| Oct 12 – Apr 13: Afghanistan: Op Herrick 17 | ||
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