With the outbreak of Pacific War initiated by Japanese sudden attack on Pearl harbor in 1942, U.S. government imprisoned 120,000 Japanese-Americans (Nikkeijin) in ten ‘Relocation Center’ for ’security’ reasons. Starting in 1943, U.S. government reviewed and examined their loyalty to the State and disloyalty to Japan. In other words, the government wanted to question whether they were ‘enemy-benefitting’, 『No-no Boy』, John Ocada’s novel published in 1957 dealt with some Japanese-American draft-resisters who had refused to be loyal to the U.S.A. My article aims to examine and analyze how the forceful internment of Japanese-Americans were related to the issues of citizenship, race, and military service, largely based on the review of Ocada’s novel 『No-no Boy』.