Defense Secretary Ashton Carter wants to give Lieutenant General John Nicholson, who leads international forces in Afghanistan, time to evaluate the situation on the ground and make proposals first.
US should remain in Afghanistan to protect Pakistan's nuclear arms, says Trump
"Let's give General Nicholson a chance to get on the ground, find out... whether or not there needs to be an adjustment," Pentagon spokesperson Peter Cook said.
Nicholson vowed to make a proposal within 90 days of taking up the post on March 2.
The number of US troops is due to drop to 5,500 starting in January 2017 -- down from 9,800 currently.
But losses by the Afghan military against Taliban fighters last year, including when the insurgents took and briefly held the northern city of Kunduz, has concerned US military officials.
With fewer US troops in Afghanistan, pressure grows for more air strikes
The American and NATO combat mission in Afghanistan officially ended in December 2014.
But since then the Taliban have managed to make significant gains against the 350,000 Afghan soldiers and police, with the 13,000 foreign troops now officially limited to training and advising them.
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