Cavalier cleared Davisville, Rhode Island on 17 February 1944 with men and equipment of two construction battalions, whom she disembarked at Honolulu 16 March.

He reported aboard the Coast Guard-crewed assault transport USS Cavalier (APA-37) in November, 1943 and saw action at Tinian and Saipan.

[1] After special amphibious training in the Hawaiian Islands, she sailed by way of Kwajalein for the invasion beaches of Saipan in the Joint Expeditionary Force Reserve.

Working at top speed, since the Japanese fleet was known to be approaching, Cavalier landed her troops, but was ordered to retire before she could get off the artillery she carried.

Leaving many of her boats behind for shuttle duty, she drew away to the east while the classic air Battle of the Philippine Sea was fought, then returned to the beachhead area on 25 June to complete offloading artillery and to embark casualties.

Next day, Cavalier cleared for Eniwetok, where the wounded were put ashore, and cargo, including 37 tons of dynamite for use in underwater demolition, was loaded.

Returning to Saipan 13 July 1944, Cavalier delivered her cargo, and loaded troops and vehicles of the 2nd Marines for the assault on Tinian.

She remained off the beach, completing her unloading and receiving casualties, until 23 October, when she cleared for Manus on the eve of the Battle for Leyte Gulf.

Sailing from Pearl Harbor to the Philippines, Cavalier embarked military passengers for transportation to San Francisco, where she arrived on 1 November 1945.

In October, she carried men and ammunition to both Inchon and Wonsan, and on 1 November, cleared for San Diego, overhaul, and local training.

From 1 to 27 August, she was at Inchon, aiding in the transfer of prisoners of war under the Korean Armistice Agreement, and after amphibious landing exercises off Japan, Okinawa, and Iwo Jima, returned to Long Beach, California on 23 April 1954.