Tarakan Island
Derrick returned to Australia with his battalion in February 1943, before transferring to the South West Pacific Theatre where he fought in the battle to capture Lae. Back in Australia the following February he was posted to an officer cadet training unit, being commissioned lieutenant in November 1944. In April 1945 his battalion was sent to the Pacific island of Morotai, an assembly point for the Allied invasion of the Philippines. Engaged in action the following month on the heavily defended hill "Freda" on Tarakan Island, Derrick was hit by five bullets from a Japanese machine gun. He died from his wounds on 24 May 1945.