GUYMON, Okla. - Three months into the job, Lupe Avalos still hears from the skeptics. His twin brother and Latino friends wonder why a 20-year-old man born in Mexico decided to volunteer for one of the oldest, clubbiest small-town traditions - the American firehouse. "They are like, 'Oh, you are over there being white again with your firefighter friends,' " said Avalos, who was born in Mexico and brought to the United States by his parents when he was 4 years old.