Maddox was struck by a suicide plane off Formosa on 21 January 1945 and retired to Ulithi for repairs. Other ships in the squadron participated in the Iwo Jima operation.
Maddox rejoined the squadron for the Okinawa operation. East of that island on 18 April 1945, Collett joined Heermann, McCord, Mertz and Uhlmann in following up a depth charge attack by aircraft from Bataan (CVL 29) and sinking submarine I-56.
The squadron closed out the war with the Third Fleet in its operations off Japan during the summer of 1945. On 22–23 July, in rough weather following the passage of a typhoon, it attacked a convoy in Sagami Wan outside of Tokyo Bay in one of the deepest penetrations of coastal waters to that time.