On February 15, 1945, "Shackle" sailed for the invasion of Iwo Jima where it successfully completed over 44 diving and salvage assignments. One of these was the battle repair of which was hit by a Japanese shore battery. During March 1945, "Shackle" served as a supporting unit for the Okinawa invasion. Between D-Day (April 1, 1945) and September 20, 1945, the ship completed 55 salvage and rescue operations on larger naval craft damaged by kamikaze attacks. There were 108 general alarms during the period.