The heuristic is that it would be in their interest to trumpet their successes.
The heuristic is that DoD doesn’t do counterterrorism. I don’t expect DoD to prevent terror attacks just like I don’t expect the FBI to blow up bunkers in Iran. We don’t need numbers to be able to confidently estimate that the number of Iranian bunkers blown up by the FBI is approximately zero.
Not if revealing success also reveals methodology and “trade” secrets.