This paper describes how the United States, the United Kingdom, Australia, and Canada recruited and trained Japanese linguists for military intelligence and what roles these linguists played during World War II. In contrast to the United States, which started recruiting Nisei even before the war started, Canada was reluctant to enlist its Nisei until 1945 when it gave in to persistent requests for their enlistment from the Australian and British armies. The British also tried to train carefully selected students for specific military purposes. Comparative examination of these programs brings to the fore the importance of paying attention to language issues in intelligence studies.