The Philippine Department (Philippine Garrison -- The Battling Bastards of Bataan) was a regular US Army unit, defeated in the Philippines, during World War II. The mission of the Philippine Department was to defend the Philippine Islands and train the Philippine Army. During World War II, on April 9, 1942, the unit surrendered to the Japanese. The Department and its sub-units were predominantly under the command of American officers, including an American general, while the majority of the troops were enlisted Filipinos, known as the Philippine Scouts (PS).