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The U.S. Army is continuing its nighttime military training exercises downtown and in the central part of the city this week. The exercises will take place between 6 p.m. and 3 a.m. every night through Friday. They'll include air and ground mobility operations and combat training in a realistic urban setting. San Antonians shouldn't be concerned if they hear low-flying helicopters, simulated gunfire, and controlled explosions during the night.