From 30 December 1944 to 22 January 1945, "Colahan" resumed duty as advanced radar picket for the 3rd Fleet raids on Formosa, Luzon, Camranh Bay in Indo-China, Hong Kong, and Hainan Island which were coordinated with the Lingayen assault. On 10 February, she put to sea to serve on the scouting line as TF 58 swept close to Japan for air strikes in the Tokyo area. "Colahan" served on radar picket duty off Iwo Jima as it was invaded on 19 February, and for 5 days afterward, returning to Ulithi for repairs and replenishment.