1 Mar, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) departs New Orleans bound for the Panama Canal Zone.

2 Apr, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) departs Balboa for Pearl Harbour.

17 Apr, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) arrives at Pearl Harbour.

7 May, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) departs Pearl Harbour for her 1st war patrol. She is ordered to patrol off Formosa.

30 May, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) torpedoes and sinks the Japanese merchant cargo ship Shisen Maru (2201 GRT) about 60 nautical miles south-east of Keelung, Formosa in position 24º32'N, 123º24'E. (see map)

2 Jun, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) torpedoes and sinks the Japanese frigate Awaji (940 tons, offsite link) east of Formosa near Yasho Island in position 22º34'N, 121º51'E. (see map)

19 Jun, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) calles at Darwin, Australia.

21 Jun, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) departs Darwin bound for Fremantle.

27 Jun, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) ends her 1st war patrol at Fremantle.

21 Jul, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) departs Fremantle for her 2nd war patrol. She is ordered to patrol in the South China Sea.

7 Aug, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) torpedoes and sinks the Japanese frigate Kusagaki (940 tons, offsite link) off Capones Island, Luzon, Philippines in position 14º51'N, 119º51'E. (see map)

10 Aug, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) torpedoes and sinks the Japanese sinking merchant tanker Shinei Maru (5135 GRT) off the north-west coast of Luzon, Philippines in position 16º15'N, 119º45'E. (see map)

21 Aug, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) torpedoes and sinks the Japanese merchant cargo ship Uga Maru (4433 GRT) in the South China Sea off the west coast of Mindoro, Philippines in position 13º21'N, 120º18'E. (see map)

27 Aug, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) sinks the Japanese merchant tanker Nanshin Maru No.27 (834 GRT) with gunfire. She also damages the Japanese merchant tanker Nanshin Maru No.25 (834 GRT) that finally runs aground. This action take place west of Mindoro, Philippines in position 12º26'N, 119º55'E. (see map)

8 Sep, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) ends her 2nd war patrol at Fremantle.

8 Oct, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) departs Fremantle for her 3rd war patrol. She is ordered to patrol in the Philippines.

31 Oct, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) torpedoes and sinks the Japaense army cargo ships Pacific Maru (5872 GRT) and Komei Maru (2857 GRT) off Botolan Point, Luzon, Philippines in position 15º17'N, 119º50'E. (see map)

4 Nov, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins), USS Ray and USS Bream shared the sinking of the Japanese transport ship Kagu Maru (6806 GRT) off Dasol Bay, Philippines in position 15º55'N, 119º44'E. (see map)

6 Nov, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins), USS Bream (Lt.Cdr. W.G. Chapple), USS Bream and USS Raton torpedo and damage the Japanese heavy cruiser Kumano (offsite link) west of Lingayen, Philippines in position 16º11'N, 119º44'E.

During this attack Guitarro is damaged by depth charges but is able to remain on patrol. (see map)

16 Nov, 1944
USS Guitarro (Lt.Cdr. E.D. Haskins) ends her 3rd war patrol at Fremantle.

11 Dec, 1944
USS Guitarro (Lt.Cdr. T.B. Dabney) departs Fremantle for her 4th war patrol. She is ordered to patrol in the South China Sea.

17 Jan, 1945
USS Guitarro (Lt.Cdr. T.B. Dabney) calles at Mios Woendi, New Guinea to make some repairs.

15 Mar, 1945
USS Guitarro (Lt.Cdr. T.B. Dabney) ends her 4th war patrol at Fremantle.

9 Apr, 1945
USS Guitarro (Lt.Cdr. T.B. Dabney) departs Fremantle for her 5th war patrol. She is ordered to patrol off Singapore.

20 Apr, 1945
USS Guitarro (Lt.Cdr. T.B. Dabney) lays mines in Berhala Strait off northeast coast of Sumatra, Netherlands East Indies.

30 Apr, 1945
The Japanese army tanker Yuno Maru (2345 GRT) is sunk by a mine, most likely laid by USS Guitarro on 20 April 1945, off the east coast of Sumatra in position 01º00'S, 104º30'E. (see map)

27 May, 1945
USS Guitarro (Lt.Cdr. T.B. Dabney) calles at Sapian.

8 Jun, 1945
USS Guitarro (Lt.Cdr. T.B. Dabney) ends her 5th war patrol at Pearl Harbour. She is now sent to the US west coast for a major overhaul.