Those CEOI's were only Confidential, but they were career killers if your chain broke out in the field, and it slipped out.
BTW, my grandson knows me as "Opa", German for grandfather.
“I had a NATO Top Secret during my tour in Germany, and it reverted to Secret when my tour ended. “Need to know” is a concept foreign to civilians, but we sure thought it was important.”
BOL: There is a nice young manager at the place where have our vehicles serviced. He was telling his help about having a top secret NATO clearance while on active duty with the AF.
In private, I asked him, when he returned to the states, what clearance did he have and if he could get near a crypto site.
He said secret and no.