Milius did an uncredited rewrite on "Dirty Harry." I suspect his contributions are what made it a hit. A few choice lines of dialogue can make a film. Milius is a weapons lover, especially guns, and that leads me to believe he wrote Harry's character-defining (and now iconic) monologue:
"I know what you're thinking. Did he fire six shots or only five? Well, to tell you the truth, in all this excitement I kind of lost track myself. But being this is a .44 Magnum, the most powerful handgun in the world, and would blow your head clean off, you got to ask yourself one question... Do I feel lucky? Well, do ya, punk?"
FPW
FAQ
"It means 'Ask the next question.' Ask the next question, and the one that follows that, and the one that follows that. It's the symbol of everything humanity has ever created." Theodore Sturgeon.