“Broken Arrow” is the U.S. military code name for an accident involving nuclear weapons. In one such incident in January 1964, Buzz One Four, a B-52 long-range bomber, crashed on a mountainside near Grantsville, Md., with two thermonuclear bombs on board. The accident had the potential to poison the entire Eastern Seaboard with radiation. It was a tragedy for the crew members lost; however, as was the case with dozens of other Broken Arrow incidents (some likely caused by the crews using amphetamines to stay awake during 30-hour flights), the damage was, miraculously, limited. The pilot of Buzz One Four was the filmmaker’s grandfather, making this a family story as well as a thoughtful artistic meditation on the destructive power of nuclear weapons. With skillful use of archival materials and a clear view of history, the horrors of the Cold War doctrine of mutually assured destruction are laid bare. TW