US steps up winter-warfare training as global threat shifts

MARINE MOUNTAIN WARFARE TRAINING CENTER, Calif. (AP) — Hunkered down behind a wall of snow, two U.S. Marines melt slush to make drinking water after spending the night digging out a defensive position high in the Sierra Nevada. Their laminated targeting map is wedged into the ice just below the machine gun. Nearly 8,000 feet up at a training center in the California mountains, the air is thin, the snow is chest high and the temperature is plunging. But other Marines just a few kilometers a