KABUL, Afghanistan- Drawdown plans announced by the US and more than a dozen other nations will shrink the foreign military footprint in Afghanistan by 40,000 troops at the close of next year, leaving Afghan forces increasingly on the frontlines of the decade-long war.

The United States is pulling out the most — 33,000 by the end of 2012. That's one-third of 101,000 American troops who were in Afghanistan in June — the peak of US military presence in the war, according to figures provided by the Pentagon.

Others in the 49-nation coalition have announced withdrawal plans too, even as they insist they are not rushing to leave. Many nations have vowed to keep troops in Afghanistan to continue training the Afghan police and army in the years to come. And many have pledged to keep sending aid to the impoverished country after the international combat mission ends in 2014.

About 14,000 foreign troops will withdraw by the end of December, according to an Associated Press review of more than a dozen nations' drawdown plans. The United States is pulling out 10,000 service members this year; Canada withdrew 2,850 combat forces this summer; France and Britain will each send about 400 home; Poland is recalling 200; and Denmark and Slovenia are pulling out about 120 combined.

Troop cutbacks will be deeper next year when an estimated 26,000 more will leave. That figure includes 23,000 Americans; 950 Germans; 600 more French; 500 additional Britons; 400 Poles; 290 Belgians; 156 Spaniards; and 100 Swedes.

General James F. Amos, commandant of the Marine Corps, told the AP that the number of Marines in Helmand province in southern Afghanistan will drop "markedly" in 2012, and the role of those who stay will shift from countering the insurgency to training and advising Afghan security forces.

Amos declined to discuss the number of Marines expected to leave in 2012.

There are now about 19,400 Marines in Helmand, and that is scheduled to fall to about 18,500 by the end of this year.

"Am I OK with that? The answer is 'yes,'" Amos said. "We can't stay in Afghanistan forever."

"Will it work? I don't know. But I know we'll do our part."

Additional troop cuts or accelerated withdrawals are possible.

Many other countries, including Hungary, Finland and Italy, are finalizing their withdrawal schedules. Presidential elections in Europe and the European debt crisis also could speed up pullout plans. Australian Prime Minister Julia Gillard said this week that Australia's training mission could be completed before the 2014 target date.

Back in June, then-US Defense Secretary Robert Gates said that when the Obama administration begins pulling troops from Afghanistan, the US will resist a rush to the exists, "and we expect the same from our allies." Gates said it was critically important that a plan for winding down NATO's combat role by the end of 2014 did not squander gains made against the Taliban that were won at great cost in lives and money.

"The more US forces draw down, the more it gives the green light for our international partners to also head for the exits," said Jeffrey Dressler, a senior research analyst at the Institute for the Study of War in Washington. "There is a cyclical effect here that is hard to temper once it gets going."

US Army Lt Col Jimmie Cummings Jr said the cutbacks that have been announced will not affect the coalition's ability to fight the insurgency.

"We are getting more Afghans into the field and we are transferring more responsibility to them in many areas," Cummings said, adding that many leaders of the Taliban, al-Qaida and the Haqqani militant networks have been captured or killed.

Afghan security forces started taking the lead in seven areas in July. They soon will assume responsibility for many more regions as part of a gradual process that will put Afghans in charge of security across the nation by the end of 2014.

Some countries are lobbying to start transition as soon as possible in areas where they have their troops deployed — so they can go home, said a senior NATO official, who spoke on condition of anonymity to discuss transition. The official insisted that those desires were not driving decisions on where Afghan troops are taking the lead. But the official said that because they want to leave, a number of troop-contributing nations faced with declining public support at home have started working harder to get their areas ready to hand off to Afghan forces.

"The big question (after 2014) is if the Afghan security forces can take on an externally based insurgency with support from the Pakistani security establishment and all that entails," Dressler said. "I think they will have a real challenge on their hands if the US and NATO countries do not address Pakistani sponsorship of these groups."