LOS ANGELES (Reuters) - Flanked by two Storm Troopers, ?Star Wars? actor Mark Hamill received a star on the Hollywood Walk of Fame on Thursday with the enthusiasm and humility that has endeared him to fans four decades after his first turn as Luke Skywalker. REUTERS/Mario Anzuoni Hamill, 66, was introduced by ?Star Wars? actor Harrison Ford and director George Lucas along with the customary beeps and squeaks of the saga?s robot R2-D2. REUTERS/Mario Anzuoni ?Mark Hamill is a character that can?t be written,? Lucas said.