Correct. Those of us that have or had clearances in the past learned to keep our mouths shut - it was a very important part of the job. Plus S3 and MP's were actively monitoring all of us, looking for any signs of compromise. All of us knowing that we were being actively watched by our own people actually helped, a lot.

Given all of that (and more), no leaks is not surprising. It is only surprising to non-military morons that literally could not keep their mouths shut if their lives depended on it. Since they themselves could not maintain OpSec, they mistakenly assume nobody else would be able to either. They are dead wrong.