The U.S. military has been stretched dangerously thin by the Iraq war, according to almost 90 percent of retired and current military officers polled on the state of America's armed forces.

Eighty percent said it would be unreasonable to expect the U.S. military to wage another major war successfully at this time, according to the poll by the Center for a New American Security think tank and Foreign Policy magazine.

More than 3,400 serving and retired officers took part in the poll, organizers said. Around 90 percent were retired officers, a large majority had combat experience and about 10 percent had served in Iraq or Afghanistan.

The findings reflect concerns expressed publicly, although usually in less stark terms, by top U.S. military officers, who say frequent long deployments to Iraq and Afghanistan have put great stress on both troops and equipment.

"We are putting more strains on the all-volunteer force than it was ever designed to bear," Army Lt. Col. John Nagl, a prominent counterinsurgency expert, said at a panel discussion in Washington on Tuesday to announce the results of the survey.

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