If you think there are only 3 levels, you clearly are not from the intelligence community....That’s for military secrets. The highest military ranking is lower than the lowest civilian intel ranking for classification.
Bolton would have had an Intel clearance, not just a military.
The highest military secrets are classified to “compartmentalize” nearly to Infinity.
Oftentimes, I wouldn’t have access to U.S.Navy data in the next room!
(AND, I wouldn’t ask...)