The American military has not properly tracked hundreds of thousands of weapons intended for Iraqi security forces and has failed to provide spare parts, maintenance personnel or even repair manuals for most of the weapons given to the Iraqis, a federal report released Sunday has concluded.

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Mr. Warner sent his request in May to a federal oversight agency, the Special Inspector General for Iraq Reconstruction. He also asked the inspector general to examine whether Iraqi security forces were developing a logistics operation capable of sustaining the hundreds of thousands of troops and police officers the American military says it has trained.

The answers came Sunday from the inspector general’s office, which found major discrepancies in American military records on where thousands of 9-millimeter pistols and hundreds of assault rifles and other weapons have ended up. The American military did not even take the elementary step of recording the serial numbers of nearly half a million weapons provided to Iraqis, the inspector general found, making it impossible to track or identify any that might be in the wrong hands.

In a written response to the inspector general’s findings, the American military largely conceded the shortcomings. The military said it would assist the Iraqis in determining the spare parts and maintenance requirements for the weapons. The military also said it has now instituted a “process to accurately issue weapons by quantity and serial number listing.”

Mr. Bowen found that the American military was not able to say how many Iraqi logistics personnel it had trained — in this case because, the military told the inspector general, a computer network crash erased records. Those problems have occurred even though the United States has spent $133 million on the weapons program and $666 million on Iraqi logistics capabilities.