The Pentagon, it says, "did commit resources to the planning of post-invasion operations."
But it adds: "In retrospect, however, the overall effort appears to have been disjointed and, at times, poorly co-ordinated, perhaps reflecting the department's ambivalence towards nation-building."
Among the flaws the report details is a lack of detailed pre-war plans to assume the duties of Saddam's government, based on expectations that US civilian agencies would take on that task.
Then came the order from Paul Bremer, the US chief administrator, to disband the Iraqi army and strip Ba'ath party members of their government jobs.
That decision caught field commanders off guard and created a pool of disaffected Sunni Iraqis motivated to step up attacks on US-led occupation forces.
Premature cutback
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| The report cites a series of flawed assumptions about Iraq[EPA] |
Moreover General Tommy Franks, the top US commander, kept insisting on an early downsizing of US ground forces to less than half the number proposed by Pentagon planners before the invasion.
The report says Franks' decision to move to a slimmed-down, short-staffed headquarters shortly after the invasion of Iraq completely took senior colleagues by surprise.
He reportedly told his officers to be ready to cut back on forces in preparation for "an abbreviated period of stability operations".
As a result Franks' successor, General Ricardo Sanchez, found himself suffering from staff shortages and a poor transfer of responsibilities.
Speaking late last year Sanchez said he "saw first-hand the consequences of the administration's failure to devise a strategy for victory in Iraq that employed in a coordinated manner the political, economic and military power of the United States."
The army study echoes many of the complaints long voiced by critics of the Bush administration.