NAME Adam Beach AGE 29 WHERE YOU’VE SEEN HIM As Nicolas Cage’s charge, the sensitive Navajo code breaker Ben Yahzee, in ”Windtalkers” JUMP START Beach, who initially enrolled in drama class to ”fool around” with friends, says Johnny Depp’s ”21 Jump Street” inspired him to act: ”He created his own identity. He’s never boring.” DREAM ROLE ”I’d love to do a horror film. I was the kid who would pretend to be Jason, put on the mask, and scare all of my friends in the middle of the night.” ATTEN-HUT! For ”Windtalkers”’ highly physical battle scenes, Beach enrolled in a fast-and-furious five-day boot camp: ”Oh, dude…on the third day, I wanted out!” PRICE OF FAME Fans in his native Canada often recognize Beach from Gap ads. ”They had me all over bus stops and billboards. Now ‘Windtalkers’ ads are all over Los Angeles. Where do I go from here?!” NEXT The similar-sounding ”Skinwalkers,” a PBS ”Mystery!” episode based upon a Tony Hillerman novel, and ”The Big Empty,” with Jon Favreau and Kelsey Grammer.