Vibrant Response 13, a major field exercise conducted by U.S. Northern Command and led by Army North got underway late last week. It tested the fictitious detonation of a 10-kiloton nuclear device in a major Midwestern city. It’s a national catastrophic incident exercise designed to test more than 9,000 service members and civilians in 11 training locations and airfields spread across 5,000 square miles in southern Indiana and northern Kentucky.

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