The Raiders were created by an order from President Roosevelt, acting on proposals from Colonel William J. Donovan and Major Evans F. Carlson. Carlson had been a soldier in the Punitive Expedition to capture Pancho Villa in Mexico and World War I, became a Marine officer during the American occupation of Nicaragua, and served as an Intelligence Officer of the 4th Marines in China. He had seen the tactics and strategy of Communist Chinese irregulars, Zhū Dé and the Eighth Route Army in particular, as they fought the occupying Japanese and became enthralled with their version of guerrilla warfare. In 1933 Carlson had commanded the Marine Detachment at the Warm Springs, Georgia vacation retreat of President Roosevelt, where he formed a close friendship with both Franklin D. Roosevelt and his son James. Carlson resigned from the Marines to speak to American businessmen to warn them against providing materials to Japan. Carlson rejoined the Marines in April 1941, gaining a commission from the Commandant as a reserve major. Carlson still had the President's ear as well as FDR's son James Roosevelt, who was now a Marine Captain and was his friend and protégé.