FILE PHOTO: Company logo and trading information for Boeing is displayed on a screen on the floor of the New York Stock Exchange (NYSE) in New York, U.S., March 13, 2019. REUTERS/Brendan McDermid

WASHINGTON (Reuters) - Boeing Co has been awarded a $4.1 billion U.S. defense contract related to the expansion and improvement of the ground-based midcourse missile defense system, the Pentagon said on Friday.