USS FORRESTAL arrived on Yankee Station in the Gulf of Tonkin on 25 July 1967 and immediately began combat operations. The first four days were routine; the fifth day, 29 July, was not.
At 10:52 AM a 5-inch Zuni rocket accidentally fired across the crowded flight deck, impacting an armed A-4 Skyhawk. The resulting explosions and fires raged for 13 hours and more, killing 135 crewmen with hundreds more injured.
More information with a list of the dead are on The Virtual Wall's USS FORRESTAL Memorial.