No. 75 Squadron and the rest of No. 78 Wing moved to Morotai in the Netherlands East Indies in late December 1944. The squadron arrived at Morotai on 21 December and flew 147 operational sorties that month during attacks on Japanese positions in the nearby Halmahera islands. Attacks on Halmahera and other islands in the NEI continued in early 1945, and No. 75 Squadron also flew sorties in support of US troops who were attacking the remaining Japanese on Morotai. These and similar operations were seen as wasteful by many of 1TAF's fighter pilots and their leaders. On 20 April, eight officers including Wilf Arthur, now a group captain and No. 78 Wing's commander, attempted to resign in protest during the "Morotai Mutiny".