Nuclear materials couriers (NMCs) might have one of the toughest and most secretive jobs in the transportation industry: hauling nuclear bombs and other dangerous material.
The drivers who make up the covert fleet transporting nuclear weapons to locations across the United States are operated by the National Nuclear Security Administration (NNSA), an organization established in 2000.
The NNSA is part of the Office of Secure Transportation (OST) in the U.S. Department of Energy (DOE).
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https://www.freightwaves.com/news/whats-it-like-hauling-nuclear-weapons-across-the-country