I suppose one could argue knowing or perceiving incompetence could lead to a national security issue.

Pretty sure that ship has sailed years ago.

Always worth noting when this topic comes up that the first time a classification was used to deny revelation of documents for "state secrets" reasons in a court of law, it turns out (we know this because the document has since been declassified as its classification expired) it was to shield the military from culpability in the death of civilian contractors in a plane that crashed due to a maintenance lapse.