FILE PHOTO - Lockheed Martin's logo is seen during Japan Aerospace 2016 air show in Tokyo, Japan, October 12, 2016. REUTERS/Kim Kyung-Hoon/File Photo

WASHINGTON (Reuters) - Lockheed Martin Corp LMT.N is being awarded a $451 million contract modification to a previously awarded contract for material and detail design in support of the construction of four Multi Mission Surface Combatant ships, the Pentagon said on Monday.

The contract involves foreign military sales to Saudi Arabia, the Pentagon said.