Instruction to all persons of Japanese ancestry living in the following area : all of San Diego County, California ...United States. Army. Western Defense Command1942]engBegins: Western Defense Command and Fourth Army, Wartime Civil Control Administration, Presidio of San Francisco, California, April 1, 1942.Ends: J.L. DeWitt, lieutenant general, U.S. Army commanding. See Civilian exclusion order no. 4.