Ash arrived at the section base at Bishop's Point on the island of Oahu on 28 August and began working on the nets that protected Pearl Harbor. She was at the Bishop's Point section base when the Japanese attacked American warships and installations at Pearl Harbor on the morning of 7 December 1941. Though she fired sporadically at some of the enemy planes during the two hours of the attack, she claimed no kills and suffered neither casualties nor damage. Following the attack, the ship served at Pearl Harbor through the end of the war. Redesignated AN-7 on 20 December 1942, she was placed in full commission that same day.
