Six Army brigades, a National Guard unit, and three military headquarters have been ordered to deploy to Iraq next summer in a move that would allow the U.S. to keep the number of troops largely steady there through much of next year.

The planned deployments involve about 26,000 troops and would maintain 14 combat brigades in Iraq from about February to early fall. But the decisions do not rule out potential changes as military leaders assess the security there and eye more troop withdrawals.

Even as violence in Iraq has plunged in the past year, cautious Pentagon leaders have resisted insistent public and congressional calls for more rapid and hefty troop pullouts. Instead, top commanders insist the security situation remains fragile, and the improvements reversible.

President Bush announced earlier this month that the U.S. will withdraw about 8,000 U.S. troops from Iraq by February, with about half leaving before the end of 2008. The number of combat brigades in Iraq will remain at the current 15 through January, when one will leave and not be replaced. Pentagon officials have suggested more reductions could be made by summer.

There are now about 152,000 U.S. troops in Iraq.

The Iraq drawdown will allow troops to be diverted to Afghanistan, where violence has escalated and commanders say they need more than 10,000 more troops to train Afghans and fight militants.

Six of the 10 units slated to head to Iraq next year are from Washington or North Carolina, with others from Texas, Kansas and Wyoming. It would mark the first time the Army's 1st Corps headquarters out of Fort Lewis, Wash., has deployed to either Iraq or Afghanistan.

The headquarters unit is commanded by Lt. Gen. Charles Jacoby, who came to prominence several years ago as the author of a report examining the treatment of detainees in Afghanistan.

He found no widespread mistreatment, but concluded there was a lack of knowledge and clear standards regarding the detention and interrogation of detainees that required changes in procedures.

The other units ordered to deploy are:

_1st Cavalry Division headquarters, Ft. Hood, Texas.

_2nd Marine Expeditionary Force headquarters, Camp Lejeune, N.C.

_4th Brigade, 1st Armored Division, Fort Bliss, Texas

_4th Brigade, 82nd Airborne Division, Fort Bragg, N.C.

_5th Stryker Brigade, 2nd Infantry Division, Fort Lewis, Wash.

_1st Brigade, 82nd Airborne Division, Fort Bragg, N.C.

_3rd Stryker Brigade, 2nd Infantry Division, Fort Lewis, Wash.

_4th Brigade, 1st Infantry Division, Fort Riley, Kan.

_115th Fires Brigade, a National Guard artillery unit from Cheyenne, Wyo.