WASHINGTON - U.S. President George Bush announced Tuesday that he will keep the U.S. force strength in Iraq largely intact until the next president takes over, drawing rebukes from Democrats who want the war ended and a bigger boost of troops in troubled Afghanistan.

The president said he will pull home about 8,000 combat and support troops by February -- a drawdown not as strong or swift as long anticipated. No more Army combat brigades will withdraw in 2008, the final year of a Bush presidency that has come to be dominated by the war.

Bush's announcement, in a speech at the National Defense University, is perhaps his last major move on troop strategy in Iraq. He said more U.S. forces could be withdrawn in the first half of 2009 if conditions improve in Iraq.

But by then, he'll be out of office. His successor will be making the wartime decisions.

There are about 146,000 U.S. troops in Iraq.

"Here is the bottom line: While the enemy in Iraq is still dangerous, we have seized the offensive, Iraqi forces are becoming increasingly capable of leading and winning the fight," Bush said.

Still, most of the U.S. forces are staying. Bush chose to emphasize that he was moving forward with "additional force reductions."

Democrats quickly shot back that Bush isn't doing enough to get troops out of Iraq, and into Afghanistan, where violence is rising.

"The President's plan to reduce force levels in Iraq may seem to signal movement in the right direction, but it really defers troop reductions until the next administration," said the chairman of the House Armed Services Committee, Rep. Ike Skelton, D-Mo. "More significant troop reductions in Iraq are needed so that we can start to rebuild U.S. military readiness and provide the additional forces needed to finish the fight in Afghanistan."

Said Senate Majority Leader Harry Reid: "I am stunned that President Bush has decided to bring so few troops home from Iraq and send so few resources to Afghanistan."

Bush showed again that he determines when and how U.S. troops return from war, despite a fiercely opposition-controlled Congress and a soured American public.

In all, about 8,000 U.S. forces will be coming back, the president said.

One Marine battalion, numbering about 1,000 troops, will go home on schedule in November and not be replaced. An Army brigade of between 3,500 and 4,000 troops will leave in February. Accompanying that combat drawdown will be the withdrawal of about 3,400 support forces over next several months.

Bush's strategy appears to leave the political calculus of the presidential race unchanged.

Democratic presidential nominee Barack Obama has advocated pulling all U.S. combat forces out of Iraq within 16 months of taking office. GOP nominee John McCain has said he would rely on the advice of U.S. military commanders to determine the timing and pace of troop reductions.

Both candidates have said more troops are needed in Afghanistan, where there has been a resurgence of the Taliban and a growth in violence.

The president offered a portrait of an Iraq on the rise by almost any measure: declining violence, improving governance, returning normalcy of life.

His military commanders say the security improvements in the country are becoming more durable, yet still fragile. That helps explain the cautious approach of keeping most U.S. forces on site, without resuming the monthly withdrawal of Army combat brigades of earlier this year.

In his upbeat account of the war, the president shared credit all around. "The progress in Iraq is a credit to the valor of American troops and civilians, the valor of Iraqi forces and the valor of our coalition partners," he said.

More than half of Bush's address was devoted to Afghanistan, the overlooked war where surging violence is demanding a stronger U.S. troop presence.

Bush outlined what he called a "quiet surge" of additional American forces there, bringing the U.S. presence to nearly 31,000, compared with about 146,000 in Iraq.

"For all the good work we have done in that country, it is clear we must do even more," the president said.

He announced that a Marine battalion that had been scheduled to go to Iraq in November would go to Afghanistan instead, and that that would be followed by one Army combat brigade.

On Iraq, senior defense officials say Bush is adopting a compromise proposal from his military team.

Gen. David Petraeus, the top U.S. commander in Iraq, had argued to keep troop levels fairly level through next June -- an even longer timeframe than Bush is embracing. But others, including Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, said they believed that withdrawing troops more quickly from Iraq represented a small risk compared to the gain that could be made by shifting more to Afghanistan.

It had been widely expected that Petraeus would recommend a faster pullback in Iraq perhaps calling for a reduction in the number of combat brigades from 15 to 14 this fall. But several recent events may have changed the calculus.

Among the more important changes was the unanticipated decision by Georgia to bring home its contingent of about 2,000 soldiers after Russia invaded the former Soviet republic in early August.

White House spokeswoman Dana Perino said Bush sought a drawdown in forces that would not jeopardize security in Iraq.

"Either way, people would question: Should he send more? Should he send less?" Perino said. "He thinks that he hit it just right -- that the Pentagon's recommendation was about the right size."

Anthony Cordesman, an Iraq expert at the Center for Strategic and International Studies, said the emerging plan also reflects the concern of U.S. commanders that rushing U.S. force reductions could lead to instability at a pivotal time of Iraqi political progress and preparedness of Iraqi forces.

"This plan does, however, mean continuing stress on both the active and reserve forces," Cordesman added.