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The United States will halt its military withdrawal from Afghanistan and instead keep thousands of troops in the country through the end of President Obama’s term in 2017, Mr. Obama will announce on Thursday, prolonging the American role in a war that has now stretched on for 14 years.
The current American force in Afghanistan of 9,800 troops will remain in place through most of 2016 under the Obama administration’s revised plans, before dropping to about 5,500 at the end of next year or in early 2017, senior administration officials said.
Some of the troops will continue to train and advise Afghan forces, while others will carry on the search for Qaeda fighters and militants from the Islamic State and other groups who have found a haven in Afghanistan, they said.
The insurgents are now spread through more parts of the country than at any point since 2001, according to the United Nations, and last month the Taliban scored their biggest victory of the war, seizing the northern city of Kunduz and holding it for more than two weeks before pulling back on Tuesday.
Yet even before Kunduz fell to the Taliban, the administration had been under growing pressure from the military and others in Washington, including Congress, to abandon plans that would have cut by about half the number of troops in Afghanistan next year, and then drop the American force to about 1,000 troops based only at the embassy in Kabul by the start of 2017.
Now, instead of falling back to the embassy — a heavily fortified compound in the center of Kabul — the administration officials said on Wednesday that the military would be able to maintain its operations at Bagram Air Field to the north of Kabul, the main American hub in Afghanistan, and at bases outside Kandahar in the country’s south and Jalalabad in the east.
There was no set date for the military to decrease the number of troops in Afghanistan to 5,500, said the administration officials, who spoke on the condition of anonymity because they did not want to pre-empt Mr. Obama’s announcement. The pace of that troop reduction would be determined largely by commanders on the ground, and the timing would also most likely provide flexibility to whoever succeeds Mr. Obama.
President Ashraf Ghani of Afghanistan had also pressed for Mr. Obama to keep more troops, and many in Washington who have worked closely with the Afghans over the past several years were loath for the United States to pull back just when it had an Afghan leader who has proved to be a willing partner, unlike his predecessor, Hamid Karzai.
Mr. Ghani is acutely aware of his country’s need for help from the United States and its NATO allies. The American military has repeatedly stepped in this year to aid Afghan forces battling the Taliban, launching airstrikes and at times sending Special Operations troops to join the fight, despite Mr. Obama’s declaration that the American war in Afghanistan had ended.
But the recent fighting in Kunduz also exposed the limits of foreign forces now in Afghanistan, which total 17,000, including American and NATO troops. It took only a few hundred Taliban members to chase thousands of Afghan soldiers and police officers from Kunduz, and the Afghans struggled to take back the city even with help from American airstrikes and Special Operations forces.
During the fighting, an American AC-130 gunship badly damaged a hospital run by Doctors Without Borders, killing at least 22 patients and staff members — and not a single insurgent.
Mr. Obama apologized for the attack, which may have violated guidelines laid down by the administration for the use of force by the military after the American combat mission ended last year. Under the rules, airstrikes are authorized to kill terrorists, protect American troops and help Afghans who request support in battles — like those in Kunduz, recently taken over by the Taliban — that can change the military landscape.
The idea behind the guidelines was to give troops leeway and to keep Americans out of daily, open-ended combat. But how much latitude Mr. Obama would allow the military moving forward was unclear.
The senior administration officials who disclosed the new plans were circumspect about many of the details, saying more aspects of the American mission next year and beyond would be disclosed when the president made his announcement.
The officials emphasized that the decision to halt the withdrawal had come after a review that began in March when Mr. Ghani visited Washington, suggesting that the administration was not simply reacting to the news out of Afghanistan in recent weeks.
“Obviously, we’re mindful of the dynamic security situation, and we’re watching and seeing how the Afghan security forces engaged quite tenaciously in the fighting for Kunduz,” one senior administration official said.
“But this posture and this number,” the official added, “has all been under discussion for months.”
It is not the first time the administration has revised the withdrawal plans. During Mr. Ghani’s visit in March, Mr. Obama announced that the United States would keep 9,800 troops in Afghanistan through 2015, instead of cutting the force in half, as had been originally planned. At the time, the White House still maintained that almost all the troops would be pulled out by 2017.
But with the situation in Afghanistan continuing to deteriorate, the military presented the administration with new options this summer. The plan that has been decided on for 2017 and beyond hewed closely to a proposal made by Gen. Martin E. Dempsey, then the chairman of the Joint Chiefs of Staff.
The officials said that 5,500 troops, along with contributions from NATO allies, which have yet to be agreed upon, would provide enough power to protect the force and continue the advisory and counterterrorism missions.
Finances were also a consideration, they said. Keeping 5,500 troops in Afghanistan would cost about $14.6 billion a year. It would have cost about $10 billion a year to maintain the much smaller force based at the American Embassy, one of the officials said.