In this artist's depiction provided by Northrop Grumman Corp., a KC-45A refuels a B-2 stealth bomber. The Air Force, Feb. 29, 2007, awarded Northrop Grumman Corp. and a European partner a $35 billion contract to build the airborne refueling planes in one of the biggest Pentagon contracts in decades. The unexpected decision has sparked outrage from union halls to the halls of Congress over the impact on U.S. jobs, prestige and national security. (AP Photo/Northrop Grumman Corp)

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