Sept. 13, 1959; Bunker Hill AFB, Indiana. 4 p.m. Witnesses:  at
       least two control tower operators and the pilot of a Mooney
       private airplane.  One pear-shaped object, colored white, cream,
       and metallic, with a trail under it.  Object showed little
       movement during 3 hours.  Attempted intercept by USAF T-33 jet
       trainer failed.