COLUMBUS, Ga. -- Pat Tillman is ready for a different challenge from the one he normally got in the NFL playing safety for the Arizona Cardinals. Pat Tillman played four seasons with the Arizona Cardinals. Tillman turned down a three-year, $3.6 million contract offer from the Cardinals in May to pursue his dream of becoming a Ranger in the U.S. Army. His military pay will be about $18,000 annually. His quest begins Monday when he begins basic training at Fort Benning, Ga., aiming for membership in the elite light infantry unit. Tillman's decision didn't surprise longtime friends. ''Pat is the...