July 27, 1952; Selfridge AFB, Michigan. 10:05 a.m. Witnesses:
       three B-29 bomber crewmen on ground.  Many round, white objects
       flew straight and level, very fast.  Two at 10:05, one at 10:10,
       one at 10:15, one at 10:20.  Each was seen for about 30 seconds.