Stateside, Swann and the 94th Civil Engineering Squadron from Dobbins Air Reserve Base, on the outskirts of Atlanta, face a very different threat. While they’re equipped to deal with a domestic terrorist act such as the Boston Marathon bombing or the Oklahoma City bombing, the vast majority of calls stem from everyday citizens who’ve stumbled upon weapons of long-ago wars – forgotten souvenirs from a tour of duty in Europe, Vietnam or the Middle East, “cool stuff” purchased from Ebay and Craigslist or relics found on rural Southern farms and pastures that were once battlefields. A typical example: Back in 2013, construction workers breaking ground on the College Football Hall of Fame in downtown Atlanta inadvertently dug up a Civil-War era cannonball, which turned out to be a live round containing gunpowder and ball bearings.
Swann grabs his government flip phone and finds a quiet corner. Opening the aged device, he hears the voice of his superior officer. A man was spotted with an ordnance on the side of Panthersville Road, a rural byway just outside Dallas, mere minutes from where Swann now sits. The rest of the information is scant and vague: A military artillery round. Potentially live.