FILE PHOTO: A man looks at a Patriot Advanced Capability (PAC-3) Missile Segment Enhancement (MSE) model by Lockheed Martin at an international military fair in Kielce, Poland September 7, 2017. REUTERS/Kacper Pempel/File Photo

WASHINGTON (Reuters) - Lockheed Martin Corp LMT.N has been awarded a $524 million modification to a contract to supply Patriot missiles and associated equipment domestically and to Qatar, Saudi Arabia and Romania, the Pentagon said on Tuesday.