For more on the loyalty questionnaire and military and draft resisters, see:
Shirley Castelnuovo, Soldiers of Conscience: Japanese American Military Resisters in World War II (Praeger, 2008)
Eric Muller, Free to Die for their Country: The Story of the Japanese American Draft Resisters During World War II (University of Chicago Press, 2003)
Eric Muller, American Inquisition: The Hunt for Japanese American Disloyalty in World War II (The University of North Carolina Press, 2007)
On Tule Lake and renunciation, see:
Michi Weglyn, Years of Infamy (University of Washington Press, 2000).