There was a mountain of documentation to look through and not much time. The administration wanted to use the momentum gained in Afghanistan to deal with Iraq once and for all. The OSP itself had less than 10 full-time staff, so to help deal with the load, the office hired scores of temporary "consultants". They included lawyers, congressional staffers, and policy wonks from the numerous rightwing thinktanks in Washington. Few had experience in intelligence.
"Most of the people they had in that office were off the books, on personal services contracts. At one time, there were over 100 of them," said an intelligence source. The contracts allow a department to hire individuals, without specifying a job description.
As John Pike, a defence analyst at the thinktank GlobalSecurity.org, put it, the contracts "are basically a way they could pack the room with their little friends".
"They surveyed data and picked out what they liked," said Gregory Thielmann, a senior official in the state department's intelligence bureau until his retirement in September. "The whole thing was bizarre. The secretary of defence had this huge defence intelligence agency, and he went around it."
In fact, the OSP's activities were a complete mystery to the DIA and the Pentagon.
"The iceberg analogy is a good one," said a senior officer who left the Pentagon during the planning of the Iraq war. "No one from the military staff heard, saw or discussed anything with them."
The civilian agencies had the same impression of the OSP sleuths. "They were a pretty shadowy presence," Mr Thielmann said. "Normally when you compile an intelligence document, all the agencies get together to discuss it. The OSP was never present at any of the meetings I attended."
Democratic congressman David Obey, who is investigating the OSP, said: "That office was charged with collecting, vetting and disseminating intelligence completely outside of the normal intelligence apparatus.
In fact, it appears that information collected by this office was in some instances not even shared with established intelligence agencies and in numerous instances was passed on to the national security council and the president without having been vetted with anyone other than political appointees."
The OSP was an open and largely unfiltered conduit to the White House not only for the Iraqi opposition. It also forged close ties to a parallel, ad hoc intelligence operation inside Ariel Sharon's office in Israel specifically to bypass Mossad and provide the Bush administration with more alarmist reports on Saddam's Iraq than Mossad was prepared to authorise.
"None of the Israelis who came were cleared into the Pentagon through normal channels," said one source familiar with the visits. Instead, they were waved in on Mr Feith's authority without having to fill in the usual forms.
The exchange of information continued a long-standing relationship Mr Feith and other Washington neo-conservatives had with Israel's Likud party.
In 1996, he and Richard Perle - now an influential Pentagon figure - served as advisers to the then Likud leader, Binyamin Netanyahu. In a policy paper they wrote, entitled A Clean Break: A New Strategy for Securing the Realm, the two advisers said that Saddam would have to be destroyed, and Syria, Lebanon, Saudi Arabia, and Iran would have to be overthrown or destabilised, for Israel to be truly safe.
The Israeli influence was revealed most clearly by a story floated by unnamed senior US officials in the American press, suggesting the reason that no banned weapons had been found in Iraq was that they had been smuggled into Syria. Intelligence sources say that the story came from the office of the Israeli prime minister.
The OSP absorbed this heady brew of raw intelligence, rumour and plain disinformation and made it a "product", a prodigious stream of reports with a guaranteed readership in the White House. The primary customers were Mr Cheney, Mr Libby and their closest ideological ally on the national security council, Stephen Hadley, Condoleezza Rice's deputy.
In turn, they leaked some of the claims to the press, and used others as a stick with which to beat the CIA and the state department analysts, demanding they investigate the OSP leads.
Allen L Roland is a practicing psychotherapist, author and lecturer who also shares a daily political and social commentary on his weblog and website allenroland.com He also guest hosts a monthly national radio show TRUTHTALK on Conscious talk radio www.conscioustalk.net