Sealift Inc., a 41-year-old Oyster Bay shipping company, has been awarded an $11.9 million option under a previously awarded contract to transport and preposition cargo for the U.S. Army, according to the Department of Defense.

The U.S.-flagged vessel chartered under the contract may carry cargo that includes explosives, ammunition and vehicles. The contract is expected to be completed by Sept. 30, 2017.

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The contract was signed with the Navy’s Military Sealift Command in Norfolk, Virginia.

Sealift operates a fleet of oceangoing ships and all operations are handled through its Oyster Bay office, according to the company website.