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WASHINGTON — The United States this year will have spent $100 billion on contractors in Iraq since the invasion in 2003, a milestone that reflects the Bush administration’s unprecedented level of dependence on private firms for help in the war, according to a government report to be released Tuesday.

The report, by the Congressional Budget Office, according to people with knowledge of its contents, will say that one out of every five dollars spent on the war in Iraq has gone to contractors for the United States military and other government agencies, in a war zone where employees of private contractors now outnumber American troops.