South Atlantic Fleet Exercise UAP 1977

On April 14, 1977, during a combined US Navy and Royal Navy exercise in the South Atlantic, Combat Information Centers aboard multiple vessels from both fleets simultaneously detected a formation of unidentified objects at altitudes in excess of 60,000 feet performing coordinated maneuvers. The formation performed sweeps of the exercise area before departing at extreme speed. The joint documentation — with both US Navy OPREP reports and Royal Navy signals going through separate national classification channels — produced one of the very few dual-nation official military UAP records in the archive. British naval officers and American counterparts compared notes during and after the incident, and the formal reports were exchanged through the US-UK special defense intelligence relationship. The incident was incorporated into the ONI's growing database of South Atlantic UAP contacts, which was cross-referenced with Brazilian Operation Prato documentation from the same year.