Patriot, they never do. They like to stay ahead of the game, and I suspect they pulled out of Nazi Germany way more advanced weaponry then they disclosed, The Germans had a Bomber that would drop a remote controlled bomb , of course the Bomber had to stay close to the bomb but they were able to guide it and strike a ship. a lot of what we see and all is created by us and hidden from us. Of course a great way to hide the information is to claim aliens.