It was a well trained professional soldier who did Fort Hood.
It was a well trained professional soldier who leaked information leading to wikileaks etc.
It was a well trained professional soldier who murdered Captain. Esposito and Lieutenant Allen.
All it takes is one bad actor.
And clearly it doesn’t take a special ops excercise for that stuff to happen. I don’t see your point.
And I would not declare Hassan or Manning to be on par with special ops soldiers. I am not familiar with the last ones you mentioned.