"Success" was detached from the screen to join Mine Division (MinDiv) 36 which sailed for Iwo Jima on the 13th. The division arrived off the island three days before the assault was to begin and started sweeping mines. "Success" operated as a minesweeper and performed antisubmarine patrols there from 16 to 25 February when she departed for Saipan. She sailed from there on 7 March and arrived at Ulithi the next day. MinDiv 36, and "Success" stood out of Ulithi on 19 March, for the Ryukyu Islands. On the 25th, they began sweeping mines in the Kerama Retto area in preparation for the U.S. Army landings there the next day.