Locked and Loaded: The Secret World of Extreme Militias
"...I don't know who the redcoats are," says Brian Vandersall, 37, who designed the exercise and tried to tamp down talk of politics among the men. "It could be U.N. troops. It could be federal troops. It could be Blackwater, which was used in Katrina. It could be Mexican troops who are crossing the border."

Or it could be, as it was for this year's exercise, an Islamic army marauding unchecked because a hypothetical pro-Muslim President has ordered U.S. forces to leave them alone. But as the drill played out, the designated opponents bore little resemblance to terrorists. The scenario described them as a platoon-size unit, in uniform, with "military-grade hardware, communications, encryption capability and vehicle support." The militia was training for combat against the spitting image of a tactical force from the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), FBI or National Guard. "Whoever they are," Vandersall says, "we have to be ready."

Amber Cummings, then 31, shot her husband James, 29, to death, dropped the Colt .45 revolver and walked to a neighbor’s to dial 911. Evidence of her torment at the dead man’s hands during years of domestic abuse would later persuade a judge to spare her a prison sentence.

On the day of the shooting, Dec. 9, 2008, the story she told and an initial search of the house brought an FBI forensic team running. James Cummings appeared to have accumulated explosive ingredients and radioactive samples. He had filled out an application to join the National Socialist Movement and declared an ambition to kill the President-elect.

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A much more sobering picture emerged from the dead man’s handwritten notes and printed records, some of which were recently made available to TIME. Fresh interviews with principals in the case, together with the documents, depict a viciously angry and resourceful man who had procured most of the supplies for a crude radiological dispersal device and made some progress in sketching a workable design. In this he was far ahead of Jose Padilla, the accused al-Qaeda dirty-bomb plotter, and more advanced in his efforts than any previously known domestic threat involving a dirty bomb. Cummings spent many months winning the confidence of online suppliers, using a variety of cover stories, PayPal accounts and shipping addresses. He had a $2 million real estate inheritance and spent it freely on his plot.

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Maine state police detective Michael McFadden, who participated in the investigation throughout, says he came to believe that James Cummings posed “a legitimate threat” of a major terrorist attack. “When you’re cooking thorium and uranium under your kitchen sink, when you have a couple million dollars sitting in the bank and you’re hell-bent on doing something, I think at that point you become someone we want to sit up and pay attention to,” he says. “If she didn’t do what she did, maybe we would know Mr. Cummings a lot better than we do right now.”