Maybe in the cold war, but these days there are plenty of repurposed civilian aircraft. They just swap out the avionics with some nicer things, add good cameras

Maybe in the cold war, but these days there are plenty of repurposed civilian aircraft. They just swap out the avionics with some nicer things, add good cameras, and have a useable and proven platform. The airframe details are self-evident enough that they may not be worth keeping secret.