And yet the methods of making nuclear bomb was leaked to everyone in practically no time at all. Relying on loyalty to America and a military oath as the main method of keeping a doomsday weapon's specifics secret obviously didn't work very well. IMHO the less people who can look up the precise details of making the absolute best nuclear bombs, the better - a secret shared is no secret at all, oath or no. Hell, it's too bad that the secret's already out, the best possible thing that could have happened is no one knowing how to make one any more. Now we need them for a deterrent at best or mutually assured destruction at worst.