WASHINGTON — Defense Secretary Donald H. Rumsfeld and his top military leader on Tuesday issued their strongest rebuttal to date of recent comments by retired generals criticizing Iraq war planning and calling on Rumsfeld to resign.

In particular, Rumsfeld said he didn't recall retired Lt. Gen. Gregory Newbold raising any objections to the war planning when he was working in the Pentagon for the Joint Chiefs of Staff.

"He never raised an issue publicly or privately when he was here that I know of," said Rumsfeld. "An awful lot of people around here were not shy about giving their views. . . . But in terms of why he would come up with this now, I just can't speak to that."

Rumsfeld said the criticism doesn't affect his ability to do his job.

Newbold, in Time magazine, said he was outspoken in his criticism before the war, saying the "zealots' rationale for war made no sense." From 2000 until October 2002, Newbold served as director of operations for the Joint Chiefs. The U.S. invaded Iraq in March 2003.

At least two other retired generals have raised similar concerns in recent weeks about the administration's war policies, including Gen. Anthony Zinni, former U.S. Mideast commander.

To date, President Bush has rejected calls for Rumsfeld to step down. The defense secretary has served in that job since shortly after Bush took office in 2001.

Gen. Peter Pace, chairman of the Joint Chiefs of Staff, said military leaders, during dozens of prewar meetings, laid out a number of questions and concerns about whether there were enough troops and resources for the invasion.

In the end, he said, "I was very comfortable with the prewar planning. I am comfortable with the way it was executed. And I would go back, given the same facts and figures, and reach the same conclusion."

Asked if the U.S. has the resources to fight the war in Iraq and another major conflict — such as a war in Iran — at the same time, Pace said there are about 2 million U.S. service members who are not in the Gulf region now.

"We have sufficient personnel, weapons, equipment, you name it, to handle any adversary that might come along," he said.

In a fundraising speech Tuesday in Des Moines, Iowa, Bush said that he understands the war has meant difficult times for Americans but that the United States is not going to retreat.

"We're not going to be intimidated by thugs and assassins," Bush said. "We will achieve victory in Iraq. And by achieving victory in Iraq, we will make it more secure for a generation of Americans. They hope that we lose our nerve. We will not lose our nerve."

Meanwhile, the State Department invited cameras to record the first meeting between Secretary of State Condoleezza Rice and Iraq's first full-fledged post-invasion ambassador to Washington.

Samir Sumaidaie told Rice he is delighted to be the "first ambassador since we got rid of the regime of Saddam Hussein with your help."

Earlier Tuesday, Gen. T. Michael Moseley, Air Force chief of staff, said that even as ground forces begin to leave, the Air Force will be needed in Iraq to carry troops and supplies, to perform surveillance and reconnaissance, and to strike targets.

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"I think the Air Force will be there like we were for the no-fly zone for a long time," Moseley told defense reporters. "I don't know yet how many bases. We're looking at reducing the number of bases. We have 18 we are flying airplanes off of right now. I see that number coming down. But I don't see the air and space component leaving soon."

As the fourth year of the Iraq war begins, nearly 21,000 Air Force personnel are in Iraq and Afghanistan, with the bulk in Iraq.

Overall there are about 132,000 U.S. forces in Iraq. Military officials have expressed hope they can reduce the number below 100,000 by year's end.

In other remarks, Moseley said it is inappropriate to comment on any plans for military action against Iran. Asked if the Air Force could destroy nuclear targets buried deep in the ground there, he said it would depend on how deep the structure is and how it is built. The military has a variety of munitions that can penetrate certain levels of concrete, steel and sand, he said.

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