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No. 1: Lockheed Martin Corp.

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2010 Top 100 rankings

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No. 2: Northrop Grumman Corp.

No. 3: Boeing Co.

No. 4: Raytheon Co.

No. 5: Science Applications International Corp.

No. 6: General Dynamics Corp.

No. 7: KBR Inc.

No. 8: L-3 Communications Inc.

No. 9: Booz Allen Hamilton

No 10: Computer Sciences Corp.

No. 11: Dell Inc.

No. 12: Hewlett-Packard Co.

No. 13: Harris Corp.

No. 14: ITT Corp.

No. 15: BAE Systems Inc.

No. 16: CACI International

No. 17: IBM Corp.

No. 18: Deloitte LLP

No. 19: Verizon Communications Inc.

No. 20: Jacobs Engineering

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