In January 1945, No. 114 MFCU was withdrawn to Brisbane, where it began preparations to participate in the Australian-led liberation of Tarakan. In April, with a complement of over 800 officers and men, and Nos. 167, 168, 308, 354 and 355 Radar Stations under its command, it embarked for Morotai in the Dutch East Indies. From there it departed for Tarakan, arriving with the main invasion force on 1 May. Controlled by No. 78 (Fighter) Wing under the Australian First Tactical Air Force (No. 1 TAF), No. 114 MFCU became operational on the island four days after the landing. In addition to its regular duties, it temporarily took responsibility for maintaining contact with No. 1 TAF headquarters on Morotai and US Army Air Forces commands in the Philippines, when equipment belonging to the RAAF's Mobile Telecommunications Unit failed to be unloaded at Tarakan before the departure of its transport ship.