During the Vietnam War, Secretary of Defense Robert McNamara created the Selective Reserve Force (SRF) in October 1965. Since funding was not available to train and equip the entire National Guard adequately, the SRF would be a core group of 150,000 National Guardsmen available and ready for immediate overseas deployment if needed. SRF units were supposed to be authorized at 100% strength, receive priority training funds and modern equipment,[42] and have more training and do 58 hours of drills of four hours each a year rather than the standard 48 hours of drills.[43]