U.S. forces had to enter Iraq from the south, so by the time Baghdad was taken, much of Saddam's military and intelligence services had dissipated into the northern cities, Rumsfeld said. "They're still, in a number of instances, still active," he said.

As Iraqi security forces develop, Rumsfeld said, they will take increasing responsibility and the insurgency will diminish over time. He estimated current Iraqi security forces at over 145,000.

U.S. forces in Iraq are being reduced from 153,000 to 137,000 or 140,000, Rumsfeld said, although it's possible more security will have to be put into place when new elections take place next year.

Rumsfeld told ABC's "This Week" that at least 30 projects are under way to reduce stress on U.S. forces. For example, he said, a new national security personnel system allows for the use of fewer military people in civilian positions, and the Pentagon is rebalancing the active force with the reserve component.

"So far, we've only used in Iraq and Afghanistan something like 40 percent of the Guard and Reserve," he said. "It's not like everything's been used up."

Gen. Richard B. Myers, chairman of the Joint Chiefs of Staff, told NBC's "Meet the Press" that the all-volunteer force is "working marvelously."

"I've served in the draft force, I've served in the volunteer force," he said. "The American public should not be at all confused about the volunteer force and how well it's performed."

On Fox, Rumsfeld defended his "old Europe" characterization of nations such as France and Germany that opposed U.S. policy in Iraq.

"That's not haunting me," he said. "I don't think it was a stunning comment, and it certainly wasn't in any way denigrating anything."

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Editor's note: