Flush with new contracts for its light tactical military vehicles, Oshkosh rocketed to the top of its peer group for companies with revenues of $5-20 billion, unseating two-time winner Precision Castparts. A surge in production of Mine-Resistant Ambush-Protected (MRAP) all terrain vehicles helped drive a 579% increase in operating profit in fiscal 2010. But revenues and profits have begun to decline as production rates turn down, and TPC analysts are questioning whether Oshkosh will be a one-year wonder.