The Department of Defense awarded 13 defense contracts Tuesday, worth $2.79 billion in combined value.

The biggest of these, a $950 million indefinite-delivery/indefinite-quantity contract to perform architect-engineering services to support military construction, military family housing, and sustainment, restoration and modernization programs for the U.S. Air Force around the world, will be divided among four privately held firms and two publicly traded companies: AECOM Technology (ACM 0.28%) and LEIDOS (LDOS 0.87%).

The six companies will compete against each other to win task orders from the Air Force, funded out of the $950 million umbrella amount. Work on these projects is funded by this contract through April 2021.

Separately, LEIDOS won a $7.3 million contract modification from the Pentagon's Washington Headquarters Services to provide mission support services for courtroom and case preparation work. Services will include linguistic, translation, and transcription support work, plus the provision of court reporters, and expert witnesses for commission hearings. This contract will run through April 14, 2016.

Separately, Jacobs Engineering (J 0.57%) and two other companies were awarded places in one of the day's other large contracts. Worth $500 million in value, this indefinite-delivery/indefinite-quantity contract also concerns architect-engineering services at various government installations within the United States and abroad. This contract, too, will run through April 2021 and will involve competitive bidding among Jacobs and the two other companies winning places under the contract.

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