Steaming for Lingayen Gulf, under air attack much of the way, the vehicle landing ship put her assault force ashore 9 January 1945 and then stood by in support, shooting down an enemy aircraft that night with only 28 rounds of 40 mm expended.

Monitor then steamed for Guadalcanal where she loaded marines for transport to Okinawa, participating in the "D-Day" landings on 1 April and then standing by off that hotly contested island until 10 May when she sailed for the United States.

During May, June, and July, the LSV made several trips between Pearl Harbor and the west coast with passengers and cargo and then in August proceeded to Saipan to load medical personnel and supplies, departing on the 15th for Japan.

Joining the 3rd Fleet off Tokyo, Monitor took on board 1,000 sailors from battleships Missouri, Indiana, Wisconsin, Massachusetts, and Alabama, conducting the first landing on the Japanese homeland on 30 August.

[citation needed] Reclassified MCS-5 on 18 October 1956, Monitor was struck from the Naval Vessel Register on 1 September 1961 and transferred to the Maritime National Defense Reserve Fleet in Beaumont, Texas.