RIVERSIDE, Calif. (AP) - Three desert cattle ranches and some former railroad property in San Bernardino County have been purchased by the U.S. Army as part of a deal that will allow it to expand its tank-training center onto land set aside as endangered-species habitat. As part of the plan, free-ranging cattle - which compete with desert tortoises for food - will be eliminated from 250,000 acres in the western Mojave Desert. It clears the way for the Army to train tank brigades in Superior Valley, an area considered crucial to survival of the reptile. "It's got the healthiest, most...