In early 1944, and in anticipation of a government decision to commit ground forces to the war against Japan, the Canadian army launched a program that sent officers to the Asia-Pacific region to observe Allied operations. The observer program was well underway when, in November 1944, the Canadian government ordered the army to prepare a division to serve under American command in the Pacific theatre. The observer program helped the army deal with two significant challenges: learning how to fight a largely unfamiliar enemy in a tropical environment, and learning how to operate as part of an American force.
Brown, Andrew L. "Stepping in New Directions: The Canadian Army’s Observer Program in the Asia-Pacific Region, 1944-45." Canadian Military History 28, 1 (2019)