| Navy | The US Navy |
| Type | Submarine |
| Class | Gato |
| Pennant | 214 |
| Built by | Electric Boat Co. (Groton, Connecticut, U.S.A.) |
| Ordered | 12 Jun 1940 |
| Laid down | 28 Dec 1940 |
| Launched | 27 Oct 1941 |
| Commissioned | 12 Feb 1942 |
| End service | 2 Dec 1968 |
| History | Converted to Hunter-Killer Submarine Mare Island Navy Yard, Vallejo, California from 5 March 1950 to 2 January 1951 and redesignated SSK-214 upon completion. |
Commands listed for USS Grouper (214)
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.Cdr. Claren Emmett Duke, USN | 12 Feb 1942 | 30 Jul 1942 |
| 2 | Lt.Cdr. Rob Roy McGregor, USN | 1 Aug 1942 | 18 Mar 1943 |
| 3 | Lt.Cdr. Martin Perry Hottel, USN | 12 Apr 1943 | 12 Nov 1943 |
| 4 | T/Lt.Cdr. Frederick Henry Wahlig, USN | 12 Nov 1943 | 1 May 1945 |
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Notable events involving Grouper include:
2 Mar 1942
USS Grouper (Lt.Cdr. C.E. Duke, USN) shifted from New London, Connecticut for Newport, Rhode Island for torpedo trials.
6 Mar 1942
With her torpedo trials completed, USS Grouper (Lt.Cdr. C.E. Duke, USN), returned to New London, Connecticut from Newport, Rhode Island.
30 Mar 1942
USS Grouper (Lt.Cdr. C.E. Duke, USN) departed New London, Connecticut for Coco Solo, Panama Canal Zone.
7 Apr 1942
USS Grouper (Lt.Cdr. C.E. Duke, USN) arrived at Coco Solo, Panama Canal Zone.
10 Apr 1942
USS Grouper (Lt.Cdr. C.E. Duke, USN) transited the Panama Canal and arrived at Balboa.
11 Apr 1942
USS Grouper (Lt.Cdr. C.E. Duke, USN) departed Balboa, Panama Canal Zone for Pearl Harbour.
26 Apr 1942
USS Grouper (Lt.Cdr. C.E. Duke, USN) arrived at Pearl Harbour from Balboa, Panama Canal Zone.
8 Jun 1942
With the Battle of Midway over, USS Grouper (Lt.Cdr. C.E. Duke) docked at Midway to take on provisions and fuel. She left Midway for her 1st war patrol on 12 June.
25 Jun 1942
USS Grouper (Lt.Cdr. C.E. Duke) torpedoed and damaged the Japanese oiler Tonan Maru No.3 (19209 GRT) east of the Bonin Islands in position 28°46'N, 136°36'E.
30 Jul 1942
USS Grouper (Lt.Cdr. C.E. Duke) ended her 1st war patrol at Pearl Harbor.
28 Aug 1942
USS Grouper (Lt.Cdr. R.R. McGregor) departed from Pearl Harbor for her 2nd war patrol. She was ordered to patrol in the East China Sea.
21 Sep 1942
USS Grouper (Lt.Cdr. R.R. McGregor) torpedoed and sank the Japanese merchant Tone Maru (4070 GRT) in the East China Sea, east of Shanghai, China in position 31°18'N, 123°27'E.
1 Oct 1942
USS Grouper (Lt.Cdr. R.R. McGregor) torpedoed and sank the Japanese troop transport Lisbon Maru (7053 GRT) about 20 nautical miles north of Chushan Island, China in position 29°57'N, 122°56'E.
9 Oct 1942
USS Grouper (Lt.Cdr. R.R. McGregor) ended her 2nd war patrol at Pearl Harbor.
12 Nov 1942
USS Grouper (Lt.Cdr. R.R. McGregor) departed from Pearl Harbor for her 3rd war patrol. She was ordered to patrol in the Solomon Islands area.
17 Dec 1942
USS Grouper (Lt.Cdr. R.R. McGregor) torpedoed and sank the Japanese passenger-cargo ship Bandoeng Maru (4003 GRT) about 15 nautical miles northwest of Cape Henpan, Buka Island, Solomon Islands in position 04°54'S, 154°17'E.
31 Dec 1942
USS Grouper (Lt.Cdr. R.R. McGregor) ended her 3rd war patrol at Brisbane, Australia.
21 Jan 1943
USS Grouper (Lt.Cdr. R.R. McGregor) departed from Brisbane for her 4th war patrol. She was ordered to patrol in the Solomon Islands / New Britain area.
18 Mar 1943
USS Grouper (Lt.Cdr. R.R. McGregor) ended her 4th war patrol at Brisbane. Under the command of Lt.Cdr. M.P. Hottel, Grouper carried out three patrols with no results before returning to Pearl Harbor. She was sent to San Francisco for an overhaul where she arrived on 19 October 1943.
5 Jan 1944
With her overhaul completed USS Grouper (Lt.Cdr. F.H. Wahlig) returned to Pearl Harbor.
24 Jun 1944
During her 9th war patrol USS Grouper (Lt.Cdr. F.H. Wahlig) torpedoed and sank the Japanese transport ship Kumanosan Maru (2857 GRT) and the Japanese tanker Nanmei Maru No.6 (834 GRT) south of Yokosuka, Japan in position 34°45'N, 139°30'E.
9 Aug 1944
During 9 and 10 August 1944, USS Baya (Cdr. A.H. Holtz, USN), conducted exercises off Pearl Harbour together with USS Canfield (Lt.Cdr. P.E. Cherry, USNR), USS Greiner (Lt.Cdr. L.H. Kiser, USN), USS Griswold (Lt.Cdr. M.C. Walley, USNR), USS Rall (Lt.Cdr. C.B. Taylor, USNR), USS Gar (Lt.Cdr. M. Ferrara, USN) and USS Grouper (Cdr. F.H. Wahlig, USN). These exercises included night exercises.
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