Actually, Top Secret is the highest level. But there are additions to that like SCI, Cosmic, CNWDI, etc. Those different additions to Top Secret limit the access to a select group of people. There was one SCI program that only 3 people on the base had access to. I routinely called up squadron commanders and told them I needed 4 aircraft and crews for a special mission and that is all the information that they would know. I then briefed the crews and off they went. When I was doing Revolutionary Planning, I came up with way to defeat stealth. I was sent over to DARPA to talk to them. They read me in and red me right back out so I could never talk about it. All of these special access type programs and designations require you to be read in and when you leave you are read out. Currently, TS/SCI is way overused so bad people can get access to things they should not be able to see.
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