Technically, all military radar is classified secret at the least. What Clinton did was forbid releasing the information, which was nuts since it is commonly released to federal authorities as needed. I was on both Flight 800 and Challenger analyst teams. For NASA we helped locate the shuttle wreckage, which was interesting because dear old dad was on the crew autopsy side of that disaster and waiting for that wreckage.
My Dear Old Dad used to be on the accident investigation teams for the Air Force for the aircraft he was responsible for writing the technical manuals for. . . I learned a lot talking to him. He'd write the technical orders for the changes required for the existing planes after they came to a conclusion about what caused the crashes. One for the F-86 was that they needed to add a washer to the screws amounting the engine to the airframe because the vibration of normal operation caused the engine to come lose inside the airframe and suddenly you'd have a rotating engine inside the aircraft, Oops. When my dad died at age 85, he still carried one of those added washers in his coin purse as a pocket piece to remind him that omitting small things could cause catastrophes.