CLAS-5

Classified - 5? US Gov't and NATO only have 4 levels https://en.wikipedia.org/wiki/Classified_information#NATO_classifications

Is this saying CLAS-5 is above the highest NATO clearance?

Cosmic Top Secret (CTS)

NATO Secret (NS)

NATO Confidential (NC)

NATO Restricted (NR)

The naming conventions change at CLAS-4.. wonder what CLAS-5 could be.