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“That’s a major change,” Carter said, something “that just a few months ago we couldn’t have planned on.”

Obama’s current plan calls for troop levels to drop by half from 10,000 by the end of this year and be at nearly zero by the end of 2016. The U.S. would maintain a security cooperation office in Kabul. Ghani has made it known he thinks that should be slowed down in order to better support Afghan forces battling a resilient Taliban insurgency.

Carter did not describe in detail what changes Obama is considering in the U.S. military presence. But he said could include slowing the withdrawal pace and changing the timing and sequencing of U.S. base closures.

He said Obama also was “rethinking the details” of the U.S. counterterrorism mission in Afghanistan, where there are remnants of al-Qaida as well as signs that the Islamic State militant group is seeking to make inroads here in addition to Iraq and Syria.

In his remarks to reporters, Ghani thanked Obama for being flexible and showing a willingness to consider “the realities on the ground.” Using similar phrasing, Carter said that when he returns to Washington he will work up recommendations to Obama, in advance of the March talks, that “reflect reality on the ground.”

Carter lauded the progress that Afghanistan has made during the 13 years since U.S. forces invaded and toppled the Taliban rule. Obama’s goal, he said, is to “make sure this progress sticks” so that Afghanistan does not again become a launching pad for terrorist attacks on the U.S.

Carter also met in the Afghan capital with Campbell and Gen. Lloyd Austin, the commander of U.S. Central Command, which has responsibility for U.S. operations in Afghanistan and across the Middle East.