After joining in training exercises off Port Purvis on Florida Island, in the Solomons, "Fletcher" arrived at Cape Sudest, New Guinea, 18 April 1944. This was her base during the next month as she supported the Humboldt Bay landings, and by covering reinforcement landings on 30 April. After escorting a convoy to Nouméa, out of which she patrolled against submarines in late May, "Fletcher" arrived at Humboldt Bay on 5 June. She made one patrol against any attempt of the Japanese to reinforce their Biak garrison, then covered and provided shore bombardment for the invasions of Noemfoor, Sansapor, and Morotai, as well as patrolling and escorting reinforcements for these various operations through the summer.