SIERRA BLANCA, Texas - Sheriff Arvin West sat behind his desk, winced and realized he was up against one of the biggest battles of his life. He is heading to Washington next week to testify before the Subcommittee on Homeland Security far from his home on the Texas plains -- far from the cotton fields, Rio Grande Valley and the small town that he holds dear. Arvin, a small-town sheriff, is considered a giant in his neck of the woods, and he'll need all his strength to battle the international incident that has landed at his front door. "It's a...