Kelly Johnson had about a dozen written rules for running the Skunk Works. The P38, F-104, U-2, and SR 71 says he knew what he was doing.
His last unwritten law was "never do anything for the Golly-geened Navy"
Ben Rich, Johnson's sucessor, violated that rule when he realised F-117 technology could build a submarine that could be invisible to sonar. The Navy told him they would never build a submarine like he suggested, because it "looked funny".
They decided to build that twin hulled stealth ship instead, the pattern for the one in the James Bond movie.