OSHKOSH, Wisc. ( TheStreet) -- The Pentagon has again increased the number of specialty fighting vehicles it will purchase from truck-maker Oshkosh ( OSK).

The order is for an additional 1,000 trucks and is worth $438 million, the company said Wednesday. Including the newest award, Oshkosh has now pulled $3.2 billion in deals with the U.S. military for a total of 6,219 vehicles.

Oshkosh, which first won the Pentagon contract in June, has benefited from the heightening of the war in Afghanistan. Last month, it reported a strong third quarter on the back of its defense business, which has helped buoy the company following a collapse in demand for its construction-equipment segments amid the recession.

Known as MRAPs (short for Mine Resistant Ambush Protected), the trucks were specifically designed to withstand the kinds of homemade bombs, or improvised explosive devices, used by insurgents in Iraq and Afghanistan. To deal with the latter's mountainous terrain, the Oshkosh version of the MRAP is lighter and has a more heavy-duty suspension system than the MRAPs used in Iraq.

In August, Oshkosh won another multi-billion-dollar contract to produce a different kind of heavy truck under a separate military program. Oshkosh beat out its competitors by underbidding, and the incumbent contractor, the UK's BAE Systems, and a third losing bidder, Navistar ( NAV), have both since filed a series of formal protests with the U.S. Government Accountability Office over the U.S. Army's choice of Oshkosh.

BAE has argued that its offer represented the lowest risk, since Oshkosh was new to this business and therefore lacked such things as relationships with suppliers. Oshkosh received a stop-work order from the Army in September and awaits a decision by the GAO next month.

Oshkosh shares, which opened higher Wednesday morning by about 2% to $39.69, have soared since the award was announced. Year-to-date, the stock has gained nearly 340%.

-- Written by Scott Eden in New York

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Scott Eden has covered business -- both large and small -- for more than a decade. Prior to joining TheStreet.com, he worked as a features reporter for Dealmaker and Trader Monthly magazines. Before that, he wrote for the Chicago Reader, that city's weekly paper. Early in his career, he was a staff reporter at the Dow Jones News Service. His reporting has appeared in The Wall Street Journal, Men's Journal, the St. Petersburg (Fla.) Times, and the Believer magazine, among other publications. He's also the author of Touchdown Jesus (Simon & Schuster, 2005), a nonfiction book about Notre Dame football fans and the business and politics of big-time college sports. He has degrees from Notre Dame and Washington University in St. Louis.