In his annual State of the Union Address to the Congress, Obama said a small force would remain in the war-torn country but did not give the number of the US troops that would be stationed in Afghanistan after 2014 drawdown.
Obama, in his prime-time address, reiterated that the US troops will be engaged in carrying out training, assisting Afghan forces and in counter-terrorism operations to pursue any remnants of the al-Qaeda.
"For while our relationship with Afghanistan will change, one thing will not: our resolve that terrorists do not launch attacks against our country," Obama said, noting that after 2014 US will support a unified Afghanistan as it takes responsibility for its own future.
Obama said more than 60,000 of its troops have already come home from Afghanistan.
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"The fact is, that danger remains. While we have put al- Qaeda's core leadership on a path to defeat, the threat has evolved, as al-Qaeda affiliates and other extremists take root in different parts of the world.
"In Yemen, Somalia, Iraq, and Mali, we have to keep working with partners to disrupt and disable these networks," Obama said.
"That's why I've imposed prudent limits on the use of drones - for we will not be safer if people abroad believe we strike within their countries without regard for the consequence," he said.