WASHINGTON (Reuters) - A senior U.S. Marine Corps general who said it was "fun to shoot some people" should have chosen his words more carefully but will not be disciplined, military officials said on Thursday. Lt. Gen. James Mattis, who led troops in Iraq and Afghanistan, made the comments at a conference Tuesday in San Diego. "Actually it's quite fun to fight 'em, you know. It's a hell of a hoot. It's fun to shoot some people. I'll be right up front with you, I like brawling," said Mattis. "You go into Afghanistan, you got guys who slap women around...