Image: US Navy
The UAVs were monitored over several days by the crew of the USS Kidd, among others, flying over the ships at high speeds, low altitude, and performing incredible maneuvers not observed in any weapons platform in the US arsenal. The incident prompted an investigation that reached the top levels of the Navy's chain of command and even the Federal Bureau of Investigation. The vivid details of the events are found in the link below.
The disturbing series of events during the summer of 2019 resulted in an investigation that made its way to the highest echelons of the Navy.