ARSENAL of DEMOCRACY

The race to arm Ukraine

- W.J.Hennigan/Scott Air Force Base, III.

Data from the truck's satellite tracking devices stream into his windowless command center at Scott Air Force Base, about 20 miles east of St. Louis, showing Hartl each stop the driver makes and the weather and road conditions ahead. Most important, as the driver navigates rushhour traffic and stretches of interstate alongside unknowing travelers, Hartl can track the condition of the volatile cargo: hundreds of high-explosive 155-mm artillery shells bound for Ukraine.

The race to supply Ukraine with the weapons it needs to win the war against Russia unfolds on Hartl's glowing screen at U.S. Transportation Command (TRANSCOM) headquarters. As a branch chief with the Army's Defense Transportation Tracking System, he watches each day as scores of trucks crisscross American highways, hauling antitank missiles, rocket launchers, air-defense systems, and artillery shells to air and naval bases. If a truck deviates from its route, or a bathroom break runs suspiciously long, Hartl is notified within seconds. "We have all sorts of alerts built in for high-risk shipments," he says, stroking a graying, chest-length beard. "If they're stationary for too long, we'll get an alert. If the trailers become untethered, we'll get an alert. If the trailer door opens, and it's not supposed to, we'll get an alert."

Nothing quite like this ever has taken place before. For the first time, a country that's outmanned and outgunned by a much larger invading foe is being openly armed and trained almost entirely by its allies. The Pentagon says the Ukraine supply mission is the largest authorized transfer of arms in history from the U.S. military to a foreign nation. More than 1,400 trucks, 230 planes, and 11 cargo ships ferried arms to Ukraine in the first four months of this year alone.