1944
Pollack got underway from Pearl Harbor 28 February 1944 and battled heavy seas as she entered the assigned area of her ninth war patrol off Nanpō Islands 18 March. Two days later she made a night surface attack and watched two torpedo hits blow 1,327-ton freighter Hakuyo Maru to pieces. On 25 March she sank 300-ton Submarine Chaser No. 54, and damaged two freighters. On 3 April she sank passenger-cargo ship Tosei Maru. She returned to Midway 11 April.
Pollack's tenth war patrol was conducted off the Nanpō Islands. She cleared Midway 6 May and was sixteen days out to sea when she moved in on about ten merchantmen with several escorts. She scored torpedo hits which sank 1,270-ton Asanagi but was held down by a fierce counter-attack while the remaining ships of the convoy escaped. She returned to Pearl Harbor 7 June.
Pollack departed Pearl Harbor for her eleventh war patrol 15 July. She touched at Majuro, Marshall Islands, and then steamed on lifeguard station in support of the air strikes made on Woleai island 1 August. She was off Yap Island 4 August – 5 August for similar duty, then patrolled in the Yap-Palau area, taking time out to shell the phosphate plant on Fais Island 27 August and 30 August. She returned to Brisbane, Australia, 12 September.
Pollack underwent a refit period at Brisbane, then got underway 6 October for exercises with HMAS Geelong until the 10th. She then steamed by way of Mios Woendi, Schouten Islands, to Pearl Harbor where she arrived 18 November for training operations off Oahu with units of the Pacific Fleet destroyer force.
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