United States Air National Guard (ANG) unit mobilizations began in October 1950 when President Harry S. Truman issued federalization orders, bringing ANG units under federal control. Eventually, some 45,000 Air Guardsmen, about 80 percent of the force, were mobilized. Initially mobilized units were deployed to Far East Air Forces (FEAF) for combat operations in Korea. Other mobilized units were deployed to Europe to reinforce United States Air Forces in Europe.