Gary Crocker: But we had to rely, in all those years, on the photo interpreter; the hero of this story is the photo interpreter. We have very little NSA-type information, electronic information. We have scant HumInt, and no defectors in this history period. So, we're relying on, first, U2 photography, which captured some very important things about the program, but we're relying on experts to look at a facility, and determine what that facility does. And these people were really good at that.