"Long" continued escort and patrol operations for the occupations of Attu and Kiska through the summer, returning to Pearl Harbor on 16 September to escort merchantmen to San Francisco where she overhauled. After patrol in Hawaiian waters from 15 November to 22 January 1944, she escorted reinforcements to Roi and Namur in the Marshalls on 2 February, then joined TF 76 on 28 February in New Guinea waters. She served as an escort and swept mines in the conquest of the Admiralties early in March, then escorted convoys to and from Milne Bay, Guadalcanal, and Espiritu Santo from Cape Sudest.