| Navy | The US Navy |
| Type | Submarine |
| Class | S-1 |
| Pennant | 125 |
| Built by | Bethlehem Steel Corp. (Quincy, Massachusetts, U.S.A.) |
| Ordered | |
| Laid down | 15 Aug 1918 |
| Launched | 9 Jun 1920 |
| Commissioned | 22 Nov 1922 |
| End service | 16 Jul 1945 |
| History | Decommissioned 16 July 1945. |
Commands listed for USS S-20 (125)
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 | Lt. George Deane Dickey, USN | 1 Jul 1937 | Apr 1941 |
| 2 | Lt. Samuel David Dealey, USN | Apr 1941 | Jul 1942 |
| 3 | Lt. Ralph Emerson Styles, USN | Jul 1942 | Aug 1942 |
| 4 | T/Lt.Cdr. Earl Twining Hydeman, USN | Aug 1942 | Oct 1942 |
| 5 | Lt. Ralph Emerson Styles, USN | Oct 1942 | late 1943 |
| 6 | Richard E. Robb, USN | late 1943 | Feb 1945 |
| 7 | Lt.Cdr. Gerald Leo Cameron, USNR | Feb 1945 | 16 Jul 1945 |
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Notable events involving S-20 include:
2 Mar 1942
USS S-20 arrived at New London, Connecticut from the Philadelphia Navy Yard.
17 Apr 1942
USS S-20 departed New London, Connecticut for Casco Bay, Maine.
18 Apr 1942
USS S-20 arrived at Casco Bay, Maine from New London, Connecticut.
24 May 1942
USS S-20 arrived at New London, Connecticut from Casco Bay, Maine.
20 Jul 1942
USS S-20 departed New London, Connecticut for Casco Bay, Maine.
21 Jul 1942
USS S-20 arrived at Casco Bay, Maine from New London, Connecticut.
28 Jul 1942
USS S-20 arrived at New London, Connecticut from Casco Bay, Maine.
30 Aug 1942
USS S-20 departed New London, Connecticut for Portsmouth, New Hampshire.
31 Aug 1942
USS S-20 arrived at the Portsmouth Navy Yard from New London, Connecticut for the installation of new torpedo firing equipment.
24 Nov 1942
Having completed her special torpedo firing tests, USS S-20, departed the Portsmouth Navy Yard for New London, Connecticut.
25 Nov 1942
USS S-20 arrived at New London, Connecticut from the Portsmouth Navy Yard.
8 Oct 1944
USS S-20 arrived at New London, Connecticut from Casco Bay, Maine.
2 Nov 1944
USS S-20 departed New London, Connecticut for Casco Bay, Maine.
3 Nov 1944
USS S-20 arrived at Casco Bay, Maine from New London, Connecticut.
19 Nov 1944
USS S-20 arrived at New London, Connecticut from Casco Bay, Maine.
26 Dec 1944
USS S-20 departed New London, Connecticut for Casco Bay, Maine.
27 Dec 1944
USS S-20 arrived at Casco Bay, Maine from New London, Connecticut.
4 Feb 1945
USS S-20 arrived at New London, Connecticut from Casco Bay, Maine.
12 May 1945
USS S-20 departed New London, Connecticut for Casco Bay, Maine.
13 May 1945
USS S-20 arrived at Casco Bay, Maine from New London, Connecticut.
22 May 1945
USS S-20 departed Casco Bay, Maine for New London, Connecticut.
2 Jul 1945
USS S-20 departed New London, Connecticut for the Philadelphia Navy Yard for decommissioning.
4 Jul 1945
USS S-20 arrived at the Philadelphia Navy Yard from New London, Connecticut for decommissioning.
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