Defense contractors with a large presence in the region

These public and private firms employ a large amount of people in the D.C. area, according to the Post 200. The list produced by Capital Business ranks the largest 200 Washington area businesses.

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General Dynamics | Employs 8,740 locally

A visitor takes a picture of a LAV Piranha II by General Dynamics Land Systems at Eurosatory 2010 in Villepinte near Paris. The company includes four operating divisions: an aerospace group that designs and builds business jets; a combat systems unit that builds military vehicles, ammunition and armor; a marine systems group that builds submarines and ships; and an information systems and technology division that builds communication systems, designs and develops networks and collects and processes intelligence.

ERIC PIERMONT / AFP/GETTY IMAGES

Lockheed Martin | Employs 12,800 locally

Visitors watch a Lockheed Martin C-130 Hercules aircraft take off during a demonstration flight at the Paris Air Show this year. Lockheed is a contracting giant whose work includes a broad variety of products and services, from building military aircraft to assisting with the 2010 Census to analyzing complex intelligence. The company had an unsettled recent history, divesting two business units; cutting in half its participation at this summer's Farnborough International Airshow, a major aerospace industry exhibition in Britain; and offering an early-exit program for top executives that was accepted by 600 of Lockheed's senior officials. The defense contractor's chief has said the company faces a changed budgetary environment and is tightening its belt accordingly.

Chris Ratcliffe / Bloomberg

CACI International | Employs 5,989 locally

CACI International, headquartered in Arlington, provides professional services such as program management as well as information technology services such as cybersecurity and integration of communications equipment, primarily to the defense and intelligence communities. The company has long depended on acquisitions for expansion, and 2010 proved no exception. CACI announced purchases of Applied Systems Research, which converts data into useable intelligence, digital map imagery company TechniGraphics and cybersecurity business SystemWare. The company has said it will continue to look for high-growth, high-margin businesses in emerging markets such as cyber, energy and health care.

Manuel Balce Ceneta / AP

Booz Allen Hamilton | Employs 14,000 locally

Nicholas Foote, Booz Allen senior consultant, performs 3-D imaging work for a defense client in 2008. Booz Allen Hamilton provides consulting services in strategy, operations and information technology to major firms, government agencies and institutions. It is one of the region's newest public companies, making its IPO in November. The company once was owned by 300 top executives, but in 2008 it separated its government business from its commercial business -- which is no longer based locally. Private-equity giant Carlyle Group then bought the government unit for $2.54 billion before the public offering and remains a major shareholder.

Courtesy of Booz Allen Hamilton

ARINC | Employs 1,000 locally

Passengers are shown using an in-flight cellphone service made possible by technology from ARINC and Telenor. ARINC provides engineering for the aerospace and defense, security and transportation industries, among others. The company's roots are in providing communications to the major commercial airlines, and ARINC continues to work with commercial aviation as well as with the U.S. military. In late 2009, the company announced it would team with Rockville-based Vizada Americas to extend its move into fixed satellite broadband service, working on a Pentagon contract to deliver such capability internationally. The company is part of Carlyle Group's portfolio.

/ Business Wire

CSC | Employs 9,782 locally

Air Force instructor pilots hone their skills in the TH-1H Weapon System Trainer during training through CSC, which provides information technology services for commercial clients as well as government agencies. It offers a variety of services, from consulting to software development to systems integration. CSC made multiple changes to its business this year, including buying a cyber-threat intelligence firm and a strategy and operations consulting firm that services electric, gas and water utilities. The company beefed up its cybersecurity business by hiring well-known information security expert Mark Rasch, and, in response to conflict-of-interest rules proposed by the Pentagon, sold off its Mission Solutions Engineering affiliate, which provided software engineering services for a Navy program.

/ PR Newswire

ManTech International | Employs 3,600 locally

ManTech's network operations center in Chantilly supports federal government customers. ManTech provides information technology and technical support to national security agencies. In early 2010, the company purchased Red Bank, N.J.-based Sensor Technologies, an intelligence firm specializing in biometrics, human terrain systems and communications. Additionally, Lawrence B. Prior III, the company's president, left for BAE Systems, leading ManTech to reorganize its top management. The presidents of the company's three main divisions were also given the title chief operating officer.

Courtesy of ManTech International

Northrop Grumman | Employs 15,053 locally

The New York, an amphibious transport dock ship, was built by Northrop Grumman Ship Systems in Avondale, La., using 7.5 tons of steel salvaged from the wreckage of the World Trade Center site. Defense contractor Northrop Grumman builds manned and unmanned aircraft; electronic systems such as sensors; ships; and communications equipment. Northrup Grumman provides technical services such as training and system maintenance. The firm kept the local business community on edge in 2010 as it sought new corporate headquarters, eventually settling on a Falls Church building. Northrop Grumman also continues to reshape its business, announcing earlier in the year that it is considering selling off its shipbuilding unit. The company had a major stumble when a network failure crashed multiple Virginia agencies' computer systems for more than a week.

Ramin Talaie / Getty Images

SAIC | Employs 15,000 locally

Contractor SAIC provides a broad range of services to the defense and intelligence communities as well as to civilian agencies. Its work includes managing supplies and equipment for the Pentagon, designing health-care applications and supporting tests of Air Force systems. In 2010, the company repositioned for what it expected to be a slowdown in defense spending, consolidating four operating groups into three. SAIC also refocused on high-growth areas such as cybersecurity, formally opening a cyber innovation center in Columbia. The firm purchased Reveal Imaging Technologies, which makes equipment for screening airport baggage, and CloudShield Technologies, an online data inspection company.

Paul J. Richards / AFP/Getty Images

FEATURED PHOTO GALLERIES

TV presenter and conservationist Anneka Tanaka-Svenska wears a hat designed by Louis Mariette during the first day of Royal Ascot, in Berkshire, west of London, on June 18, 2013. The five-day meeting is one of the highlights of the horse racing calendar. Horse racing has been held at the famous Berkshire course since 1711 and tradition is a hallmark of the meeting. Top hats and tails remain compulsory in parts of the course while a daily procession of horse-drawn carriages brings the Queen to the course. AFP PHOTO / ADRIAN DENNISADRIAN DENNIS/AFP/Getty Images

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Royal Ascot, protests in Brazil, Lego exhibition, flooding in India, Cheetah-Cub robot and more.

Two-year old male rat named Dyatlik wears a costume during a rodent exhibition in Minsk, Belarus, Saturday, June 15, 2013. (AP Photo/Sergei Grits)

Animal views

Rodent exhibition, swimming with elephants, Mexico’s feline mayoral candidate and more.

WASHINGTON, DC - JUNE 14: Johnathon Carrington, valedictorian at Dunbar High School, laughs with family and friends after his school's graduation ceremony at Howard University on Friday, June 14, 2013, in Washington, DC. Carrington, who grew up in Tyler House public-housing apartments and is graduating from one of DC's low-performing high schoolsy, where academic expectations are high. (Photo by Jahi Chikwendiu/The Washington Post)

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Johnathon Carrington graduated Friday as the valedictorian of his neighborhood school, Dunbar High, and is headed to Georgetown University. But Carrington, 17, is nervous, and so are...

U.S. actress Sandra Bullock poses for the media during a photocall to promote her latest move 'The Heat' in Berlin June 18, 2013. REUTERS/Fabrizio Bensch (GERMANY - Tags: ENTERTAINMENT)

Eye on entertainment

Sandra Bullock, Jessica Sanchez, Snooki, Billy Porter, Billy Crystal, Sean Hayes, Gwen Stefani and other celebrities.

Inmates walk at a high-security male prison camp outside Russia's Siberian city of Krasnoyarsk May 14, 2013. High-security male prison camp number 17 is intended to house male inmates who are serving a sentence for the first time, and have been convicted for serious crimes. Prisoners at the facility work in wood and metal processing shops, manufacture furniture, sew clothes and do other kinds of work. They can also take part in educational, sport and cultural programs. Picture taken May 14, 2013. REUTERS/Ilya Naymushin (RUSSIA - Tags: CRIME LAW SOCIETY) ATTENTION EDITORS: PICTURE 4 OF 29 FOR PACKAGE 'INSIDE SIBERIA'S PRISONS' SEARCH 'ILYA PRISON' FOR ALL IMAGES

Life in a Siberian prison

A look inside a high-security prison camp outside Krasnoyarsk, Russia

LONDON, ENGLAND - JUNE 16: Reenactors dressed as knights stage a medieval jousting competition at Eltham Palace on June 16, 2013 in Eltham, England. The 'Grand Medieval Joust' event at Eltham Palace, an English Heritage property which was the childhood home of King Henry VIII, aims to give a great insight into life at the palace during the medieval period. (Photo by Oli Scarff/Getty Images)

The Grand Medieval Joust

The Grand Medieval Joust at Eltham Palace, an English Heritage property that was the childhood home of King Henry VIII, aims to lend insight through reenactment into life at the palace...

In this June 8, 2013 photo, youth compete in the Sao Carlos slum local soccer tournament in Rio de Janeiro, Brazil. The pitch is just dirt and the incandescent lights aren't so bright. But when the boys' feet strike the football in the Sao Carlos slum as night falls every Saturday, big league dreams glow, inflated by the hope of escaping the shantytown with sporting skills. (AP Photo/Felipe Dana)

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WASHINGTON, DC - JUNE 16: John F. Tatum Sr. hugs his grandson John F. Tatum III during his annual Father's Day block party on Sunday, June 16, 2013 in Washington, DC. (Photo by Amanda Voisard/For the Washington Post)

Father’s Day picnic in Northeast D.C.

A decades-old backyard barbecue in Northeast Washington draws hundreds in honor of dads everywhere. “It’s off-the-chain fun,” says Butch McNair, who has worked one...

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