Boeing Co beat out Lockheed Martin to retain its position as the prime contractor for the US long-range missile shield, the Pentagon said on Friday.

The US defense department said it was awarding Boeing a $3.48 billion, seven-year contract to develop, test, engineer and manufacture missile defense systems.
A team led by Lockheed Martin Corp and Raytheon Co had vied with Boeing to expand and maintain the Ground-based Midcourse Defense, or GMD, hub of layered antimissile protection.
Boeing partnered with Northrop Grumman Corp to retain the work.
"We believe the government conducted a fair and open competition, making the right decision for the future of the program," Norm Tew, Boeing vice president and program director of GMD, said in a statement.
Lockheed said it was "honored" to have participated on the bid, a company spokesperson said in a statement on Friday.
The GMD contract's value to Boeing will have been about $18 billion from January 2001, when it formally became the system's prime contractor, through the end of this year, Boeing has said.
GMD uses radar and other sensors plus a 20,000-mile fiber optic communications network to cue interceptors in silos at Fort Greely, Alaska and Vandenberg Air Force Base, California.
{{/usCountry}}GMD uses radar and other sensors plus a 20,000-mile fiber optic communications network to cue interceptors in silos at Fort Greely, Alaska and Vandenberg Air Force Base, California.
{{/usCountry}}The shield has been shaped initially to guard against ballistic missiles that could be fired by Iran and North Korea. It is the only US defense against long-range missiles that could be tipped with chemical, biological or nuclear warheads.