In southern West Germany about 75 miles east of Stuttgart, U.S. Army Captain Terry Quinn points cheerfully at a squat, wide-track staff vehicle parked near a rural Bavarian crossroads. "That," he says, "is a tank." Nearby a sergeant fans a deck of cardboard chits with shell totals printed on them. "And this," he says, "is our ammunition."
Quinn's half a dozen soldiers are playing war games with their car and their cards, part of an annual exercise that once was the spectacular, costly and sometimes dangerous pride of the U.S. armed forces. The maneuvers, part of the "Reforger" exercise by which...