The order from the Army TACOM Life Cycle Management Command is worth more than $797 million.
Oshkosh said the order is part of a five-year contract awarded to Oshkosh Defense for the production of the Army's family of medium tactical vehicles -- with support services and training -- through fiscal 2013.
The order brings total FMTV orders to date to more than 14,000 trucks and trailers.
The Army's delivery order includes more than 4,150 trucks and 590 trailers. Deliveries are to begin next September and finish in August 2012.
"We are eager to fill this new order and continue to drive Oshkosh FMTVs off the production lines and into the field," said Mike Ivy, vice president and general manager of Army Programs for Oshkosh Defense. "Whether used domestically, on the battlefield or elsewhere around the world, the FMTV's many variants are integral to keeping supply chains moving for Army missions."
The FMTV is a series of 17 models ranging from 2.5-ton to 10-ton payloads.