For the next week, the fast transport prepared for the invasion of Okinawa. On the 21st, she stood out of Ulithi as part of the Gun Fire and Covering Force under Rear Admiral Morton L. Deyo. The warships arrived off Okinawa on 25 March and approached Kerama Retto to reconnoiter the southwestern tip of Tokashiki. During the next four days, "Barr" put UDT 13 ashore on Keise Shima, a group of small sand and coral islands between Kerama Retto and Okinawa, to gather information and blast passages through the reef for the LSTs.