WARRENVILLE, Ill. (April 17, 2008) Armor upgrades to Mine Resistant Ambush Protected (MRAP) vehicles will provide U.S. troops with a tougher defense against evolving explosive threats. Navistar Defense, LLC won a contract valued at more than $261 million from the U.S. Marines for engineering upgrades to the armor used on International® MaxxPro™ MRAP vehicles. Navistar Defense, formerly known as International Military and Government, LLC, is a wholly owned affiliate of Navistar International Corporation (Other OTC: NAVZ).

Under the new contract, armor protection on production MaxxPro MRAP vehicles will be increased to that of the MaxxPro Plus protection level.

MaxxPro MRAP vehicles are designed to protect troops from roadside bombs and other threats. To date, the military has ordered 5,214 total production MaxxPro MRAP vehicles.

“Our close collaboration with the U.S. military allows us to swiftly adapt our vehicles to meet the growing threats and challenges faced by our troops in theater,” said Archie Massicotte, president of Navistar Defense. “It is a privilege to build and service the MaxxPro MRAP vehicles because this is about protecting our troops so they can fulfill their missions safely.”

Navistar International Corporation (Other OTC: NAVZ) is a holding company whose wholly owned subsidiaries produce International® brand commercial and military trucks, MaxxForce™ brand diesel engines, IC brand school and commercial buses, and Workhorse brand chassis for motor homes and step vans. It also is a private-label designer and manufacturer of diesel engines for the pickup truck, van and SUV markets. The company also provides truck and diesel engine parts and service. Another affiliate offers financing services. Additional information is available at www.Navistar.com/newsroom.

Media contact: Tim Touhy, 630-753-3869
Investor contact: Heather Kos, 630-753-2406
Web site: www.navistar.com/newsroom