Although Jung enlisted in the Canadian Army in 1939, he did not receive his first assignment until 1944, mainly because politicians in Ottawa and Victoria did not want to deal with the issues of enfranchising the Chinese after the war. However, Winston Churchill's wartime Special Operations Executive recruited Jung and a group of Chinese-Canadian soldiers into Force 136, a team of secret agents who deployed to British Malaya to train local guerrillas to resist the Japanese Imperial Army occupying Malaya and Singapore. The mission for the Asian Canadian soldiers was known as Operation "Oblivion". They received parachute training at Australia and prepared themselves to fight in South West Pacific. However, the operation came to an abrupt cancellation. Jung instead deployed to Japanese-occupied British Borneo and New Guinea, and lead his troops in search and rescue missions.