Defense staffers, NSA contractors, and even a program manager at DARPA...part of hundreds of Defense Department employees who "used credit cards or PayPal to purchase images of children in sexual situations...Astonishingly, nine of those had "Top Secret Sensitive Compartmentalized Information" security clearances, meaning they had access to the nation's most sensitive secrets. All told, 76 of the individuals had Secret or higher clearances."
The Pentagon only succeeded in prosecuting a handful.
...the Pentagon's Defense Criminal Investigative Service (DCIS) cross-checked the ICE list against military databases to come up with a list of Defense employees and contractors who appeared to be guilty of purchasing child pornography. The names included staffers for the secretary of defense, contractors for the ultra-secretive National Security Agency, and a program manager at the Defense Advanced Research Projects Agency. But the DCIS opened investigations into only 20 percent of the individuals identified, and succeeded in prosecuting just a handful...
Investigative Documents...here and here.