After fitting out, trial runs, and training, "Pogy" arrived Pearl Harbor 5 April 1943. On 15 April she set out for her patrol area along the eastern coast of Honshū, making her first contact 1 May. Her periscope attack on a convoy of five ships with one escort sank ex-gunboat "Keishin Maru", and damaged a small freighter. Upon surfacing that night, "Pogy" attacked a destroyer with three torpedoes, but was unable to observe the results. The next day she destroyed a large sampan by gunfire. On 9 May while making a submerged attack on a convoy of four freighters, a bomb close astern forced "Pogy" to retire. On 11 May, she sank a 100-ton sampan by gunfire. Two torpedo hits sent a small freighter to the bottom 26 May, and on 5 June "Pogy" retired to Midway.