Leslie joined the unit as a Private from 75th Light Aid Detachment, after the fall of Koepang, approx. March 1942. He was one of the former Koepang men, who moved to the village of Mape for intensive commando training and in May 1942 he joined in No 7 Section, “C” Platoon. After the campaign on Timor, he embarked with the unit, for Australia aboard the Royal Dutch destroyer “Tjerk Hides” on either 11 Dec 1942 or 16 Dec 1942, as the embarkation rolls do not differentiate.
He was discharged on 1 Feb 1946.