The 2004 Nimitz Encounter Off San Diego: Unidentified Objects, Infrared Footage, and an Unresolved Case

To the point

Commander David Fravor and other Navy pilots saw unknown, fast-moving objects off San Diego in 2004 that outpaced and outmaneuvered their jets, and the incident remains unexplained with three possible explanations: misinterpretation or sensor failure, a secret program, or alien craft.

That Time the U.S. Navy Had a Close Encounter With a UFO
popularmechanics.com

That Time the U.S. Navy Had a Close Encounter With a UFO

The 2004 sighting remains unexplained to this day.