| Navy | The Royal Navy |
| Type | Minesweeper |
| Class | YMS |
| Pennant | J 821 |
| Built by | Seattle Ship Building and Dry Dock Co. (Seattle, Washington, U.S.A.) |
| Ordered | 11 Jun 1941 |
| Laid down | 11 Aug 1941 |
| Launched | 28 Feb 1942 |
| Commissioned | 3 Aug 1942 |
| End service | |
| History | Returned to the USN on 1 September 1947. |
| Former name | BYMS 21 |
Commands listed for HMS BYMS 2021 (J 821)
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | Skr. William Walter Cockrill, RNR | 12 Mar 1942 | 1 Oct 1945 |
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