Trade visitors are seen walking over a road crossing covered with Lockheed Martin branding at Farnborough International Airshow in Farnborough, Britain, July 17, 2018. REUTERS/Toby Melville

WASHINGTON (Reuters) - Lockheed Martin Corp LMT.N has been awarded a $997 million U.S. defense contract for the upgrade of 84 F-16 aircraft to the V-configuration, the Pentagon said on Thursday.