Military officials say contractors cut costs while allowing troops to focus on fighting rather than on other tasks.
"The only reason we have contractors is to support the war fighter," said Gary Motsek, the assistant deputy undersecretary of Defense who oversees contractors. "Fundamentally, they're supporting the mission as required."
But critics worry that troops and their missions could be jeopardized if contractors, functioning outside the military's command and control, refuse to make deliveries of vital supplies under fire.
At one point in 2004, for example, U.S. forces were put on food rations when drivers balked at taking supplies into a combat zone.
Adding an element of potential confusion, no single agency keeps track of the number or location of contractors.
In response to demands from Congress, the U.S. Central Command began a census last year of the number of contractors working on U.S. and Iraqi bases to determine how much food, water and shelter was needed.
That census, provided to The Times under the Freedom of Information Act, shows about 130,000 contractors and subcontractors of different nationalities working at U.S. and Iraqi military bases.
However, U.S. military officials acknowledged that the census did not include other government agencies, including the U.S. Agency for International Development and the State Department.
Last month, USAID reported about 53,000 Iraqis employed under U.S. reconstruction contracts, doing jobs such as garbage pickup and helping to teach democracy. In interviews, agency officials said an additional 300 Americans and foreigners worked as contractors for the agency.
State Department officials said they could not provide the department's number of contractors. Of about 5,000 people affiliated with the U.S. Embassy in Iraq, about 300 are State Department employees. The rest are a mix of other government agency workers and contractors, many of whom are building the new embassy.
"There are very few of us, and we're way undermanned," said one State Department official who spoke on condition of anonymity. "We have significant shortages of people. It's been that way since before [the war], and it's still that way."
The companies with the largest number of employees are foreign firms in the Middle East that subcontract to KBR, the Houston-based oil services company, according to the Central Command database. KBR, once a subsidiary of Halliburton Co., provides logistics support to troops, the single largest contract in Iraq.
