during the first 24 hours of the crisis, 34 air national guard fighter units flew 179 missions. eighteen tanker units generated 78 aircraft in the same time period. through 28 september, for example, the alabama air national guard's 117th air refueling wing kept aircraft aloft on a continuous basis. air national guard units also contributed 111 c-130 aircraft for movement of personnel and equipment to needed locations, and more than 3,000 ang security forces personnel supported the mission, augmenting civilian security police as necessary. a week after the attacks, secretary of defense donald rumsfeld announced the call up of over more than 5,000 members of the air national guard and air force reserve to support the nation's increased security requirements. on 22 september, president george w. bush mobilized about 5,100 more members of the air reserve components, including approximately 3,000 air refueling and about 130 security specialists.