In this Aug. 25, 2008 file photo, an American Humvee vehicle patrols inside the new airport, currently under construction, in Najaf, Iraq. The Pentagon said Weddnesday, Oct. 29, 2008, teams led by Lockheed Martin, General Dynamics, and Northrop Grumman will compete to develop a lightweight vehicle to... (AP Photo/Alaa al-Marjani, file)