There's an old chestnut which is attributed to someone who was very senior at the Skunk Works, which goes that whatever is in the public domain is actually fifty years or so behind what they are actually doing in their highest security research facilities.
The US military budget is so vast that money can easily be shunted into corners for this stuff. I'm sort of excited that there are amazing things out there in the "black" that represent the sort of advances that will keep aviation progressing, rather than the boring tube-and-two stuff the civil airframers are cranking out.