1945: The USS Indianapolis, which had just delivered key components of the Hiroshima atomic bomb to the Pacific island of Tinian, was torpedoed by a Japanese submarine. Only 316 of the 1,196 men survived the sinking and shark-infested waters.
1965: President Johnson signed the Medicare bill into law.
1975: Former Teamsters union President Jimmy Hoffa disappeared in suburban Detroit. Although presumed dead, his remains never have been found.