One of the two remaining divisions, the Third Infantry, is just back from Iraq and not yet up to full capacity.
But Rumsfeld said the Army's rating system for combat readiness may be outdated and inappropriate during a period in which the nation is at war.
In an interview aboard his plane while flying from Iraq to a refueling stop in Ireland yesterday, Rumsfeld said he intended to discuss the matter soon with General Peter Schoomaker, Army chief of staff.
"Our force today is as trained, equipped, experienced, combat-hardened" as in any recent time, Rumsfeld said. Even though Army vehicles and aircraft need refurbishing or replacement and troops need rest and fresh training, that does not mean they are not ready for further combat, he added.
After recent military exercises, senior commanders have concluded that the United States has "the capabilities today to fulfill" the Pentagon's contingency plans for war, Rumsfeld said.
Army officials acknowledged that the force is stretched but say the drop in readiness will not leave the United States vulnerable if a new fight arises with an adversary, such as North Korea. Troops from the National Guard, reserves, and the other military services are capable of joining any fight, and the recovering soldiers could be quickly reactivated if they are needed, officials said.
The Army's Fourth Infantry, 101st Airborne, First Armored, and 82d Airborne divisions are expected to leave Iraq by May. When those troops return, they will need at least six months to rest, resume training, and repair helicopters, tanks, Humvees, and other gear that has been pushed to or past the breaking point in Iraq's harsh desert environment.
During retraining, the formal readiness ratings of those divisions will fall to the lowest or second-lowest level, first reported by The Wall Street Journal.
"The dip in readiness is a natural result of troops returning home," said Kim Waldron, spokeswoman for Army Forces Command in Atlanta.Some have grumbled about the strain on the force. "Beware a 12-division strategy for a 10-division army," former Army chief of staff, General Eric Shinseki, said when he retired last summer.