The National Security Advisory Group included former U.S. Secretary of Defense William Perry and former U.S. Secretary of State Madeleine Albright, along with other members of the Clinton administration.
"We believe that the Bush administration has broken faith with the American solider and Marine," the panel says in a report entitled "The U.S. Military: Under Strain and at Risk."
The report claims President George W. Bush failed to plan adequately for post-war Iraq operations, failed to provide enough forces and did not adequately equip those sent.
"The strains on the U.S. Army and Marine Corps are serious and growing and the viability of our all volunteer forces is at risk," the group concluded.
The National Security Advisory Group was set up last March by Democratic Party leaders in Congress to "to advise congressional Democrats on key issues of America's defense and national security policy," the release announcing the formation said.