UPDATE 1-U.S. Army says issues stop-work order for Oshkosh truck deal

WASHINGTON, Sept 11 (Reuters) - The U.S. Army on Friday said it had issued a stop-work order to Oshkosh Corp on a contract valued at up to $6.75 billion for 17,000 new armored trucks, following a protest filed against the contract award this week by Lockheed Martin Corp.