By ANGELA CHARLTON, Associated Press PARIS (AP) — Seventy-five years ago, they helped free Europe from the Nazis. This weekend, U.S. veterans are back in Paris to celebrate, and commemorate. Now in their 90s, these men aren't afraid to cry about what they saw in World War II. And they want everyone to remember what happened back then, so that it doesn't happen again. "The veterans, all the veterans