• Lockheed Martin

$1.36 billion / Employees: 11,000

Range of work: Simulations for training, logistics, flight training as well as R&D and production of smart combat systems, high-performance missiles and fire control systems

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• Raytheon

$1.28 billion / Employees: 2,300

Range of work: Communications systems, training services, cybersecurity

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• Northrop Grumman

$748 million / Employees: 4,300

Range of work: Airborne electronic warfare, aircraft, lasers, simulation, intelligence collection and analysis, software, systems, communications

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• DRS Technologies

$513 million / Employees: 1,450

Range of work: Ultra-rugged tactical computers, reconnaissance and surveillance equipment

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• Hellfire Systems

$454 million

Range of work: Lockheed-Martin employees perform all work on behalf of Hellfire.

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• General Dynamics

$395 million / Employees: 2,500

Range of work: Next-gen computers and communications, training and simulation, aviation maintenance, combat-vehicle electronic systems and munitions production services

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• Jacobs Engineering

$302 million / Employees: 2,000

Range of work: Professional technical services

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• Harris Corp.

$282 million / Employees: 6,500

Range of work: Communications

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• Honeywell

$252 million / Employees: 2,290

Range of work: Primarily avionics work for space and defense

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• Hensel Phelps Construction

$237 million / Employees: 235

Range of work: Builder, 7th Special Forces complex, Eglin Air Force Base; U.S. Southern Command HQ in Doral

Source: Department of Defense, 2009 figures; employment numbers from companies