#TDIH - Raising the roof on Mitchell Hall On January 6, 1958, the two-acre, 1,150-ton roof of Mitchell Hall was put into place. It took hydraulic jacks six hours to raise the pre-assembled roof 24 feet and put it into place on 16 columns. Today Mitchell Hall provides three meals a day to our 4,000 cadets. #YourAcademy #AF75