Last fall, Vietnam veteran James Gilchrist, 56, was listening to George Putnam's talk show on KCAA-AM (1050). He often listens to conservative radio shows in his small home office in an Aliso Viejo planned community, where he proudly displays his Purple Heart and dog tags.He heard a guest on the show, Chris Simcox, complain about lax border enforcement. His words resonated with Gilchrist, who long wondered why communities in Orange County teemed with people who don't speak English. Gilchrist called Simcox, a veteran crusader against illegal immigrants at the Arizona border.