"I feel confident that we can stay on a path that by the end of 2014, our troops will be out and will not be in a combat role and Afghans will have capacity, just as Iraqis, to secure their own country," Obama told ABC News.
Obama, criticized by Republican opponents for apologizing to Afghan people after US troops sent copies of the Koran to an incinerator at Bagram airbase, defended his decision, saying it was necessary to try to quell the violence.
"The reason that it was important is the same reason that the commander on the ground, General (John) Allen, apologized. And that is to save lives. And to make sure our troops who are there right now are not placed in further danger," the president said.
"It calmed things down. We're not out of the woods yet," he added.
"But my criteria in any decision I make, getting recommendations from folks who are actually on the ground, is what is going to best protect our folks and make sure that they can accomplish their mission," Obama said.
"Everything else -- the politics or second guessing of these various decisions -- I'm not worried about."
The incident set off seven successive days of protest and violence, with the death toll estimated at about 40.
Two US military advisers were gunned down in the interior ministry in Kabul on Saturday, days after two US troops were killed by an Afghan soldier in the east, prompting Nato to pull its advisors out of Afghan government ministries.
"The overwhelming majority of Afghan troops have welcomed and benefited from the training and partnering that we're doing," Obama said.
"That doesn't mean there aren't going to be some tragic incidents. That doesn't mean there aren't going to be bumps in the road."
Nato has a 130,000-strong US-led military force fighting the Taliban, which has led an insurgency against the Western-backed Kabul government since being toppled from power in 2001.
The United States plans to gradually draw down combat troops from mid next year before handing over control to Afghan security forces by the end of 2014 as agreed by the Nato alliance.
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In the history of Afghanistan the different ethnic tribes there had their territories and co-existed peacefully. Then saw aggressors come and go and one by one. They had always stood up and rebelled against foreign occupations. In modern times the Russians had learned their lesson and so must the Americans.
Another VIATNAAM.
They Invade, kill , destroy and then run