For discussions of everything that might be classed as ‘paranormal‘ - i.e. not currently accepted by our modern scientific paradigm.
Yeah, it doesn't have to be "the greys" from Zeta Reticuli. It could be an experimental technology developed right here on Earth. Maybe even by the same government that operates the carrier battle group. The Nimitz was apparently testing a new integrated radar system that combined radar and other data from all of the ships in the battle group to create a unified battlefield view. Could the new tech have penetrated a formerly effective "cloak" technology?