By late 1943, Major Volckmann was the highest-ranking American officer in northern Luzon, and commanded five regiments of Filipino guerrillas. (Courtesy of U.S. Army Special Operations Command History Office)

By late 1943, Major Volckmann was the highest-ranking American officer in northern Luzon, and commanded five regiments of Filipino guerrillas. (Courtesy of U.S. Army Special Operations Command History Office)