The U.S. Navy conducts a successful test flight Feb. 22,...

The U.S. Navy conducts a successful test flight Feb. 22, 2012, of a Trident II D5 Fleet Ballistic Missile built by Lockheed Martin. Credit: U.S. Navy / Lockheed Martin

Lockheed Martin Corp.’s Mitchel Field unit has won a Defense Department contract worth $55.7 million to provide navigation engineering support services for U.S. and United Kingdom submarine-based Trident II missiles.

The contract is expected to be completed August 2018, but work could be extended through August 2020 and the value could reach $108.6 million if all options are exercised.

Lockheed, based in Bethesda, Maryland, has been the U.S. Navy’s prime contractor for the Trident navigation system since 1955. Trident missiles are capable of carrying multiple nuclear warheads that can be directed at individual targets.

Lockheed, with a workforce of almost 100,000, employs about 200 people at Mitchel Field, a former U.S. Air Force base that was decommissioned in 1961.

NewsdayTV's Doug Geed shows us some great spots 'Out East' to visit this summer. Credit: Brian Jingeleski, Randee Daddona

Out East Show: LI Aquarium, Patty's Berries and Bunches, Palmer Vineyards NewsdayTV's Doug Geed shows us some great spots 'Out East' to visit this summer.

NewsdayTV's Doug Geed shows us some great spots 'Out East' to visit this summer. Credit: Brian Jingeleski, Randee Daddona

Out East Show: LI Aquarium, Patty's Berries and Bunches, Palmer Vineyards NewsdayTV's Doug Geed shows us some great spots 'Out East' to visit this summer.

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