The U.S.S. Gyatt was stationed in the Atlantic when its radar detected a bogey approaching the island from the northeast at speeds exceeding Mach 1.
The Gyatt relayed a message to Roosevelt Roads Navy Base in Puerto Rico, which then contacted an F-8C aircraft of Utility Squadron Eight.
This aircraft was already flying at an altitude of 30,000' over Puerto Rico.
The aircraft reported a stranger closing in very fast.
The pilot of the F-8C described the object as delta shaped and about the size of a fighter.
Its color was black or gray and had no lights.
It had no contrail but had a light source emitting from the tail during periods of acceleration.
The pilot pursued the bogey but could not intercept.
The target accelerated out of sight in a wide starboard turn climbing through 50,000' at about 19° angle of climb in excess of Mach 1.