Some 150,000 NATO troops are currently stationed in Afghanistan.
A recent poll shows the American people's support for the Afghan war has dropped to the lowest level since President Barack Obama took office.
The survey conducted by Quinnipiac University showed that a majority of voters believed the US should not be involved in Afghanistan.
The support level in the survey has dropped to 41 percent, which is well below the peak of 59 percent a year ago.
Meanwhile, Australia and Britain have warned that 2011 and 2012 will be critical years for the Afghan war, as the US-led forces will have difficult times ahead in Afghanistan.
Almost a decade since the US-led invasion of Afghanistan, foreign forces are experiencing tough times with rising fatalities.
According to official figures, more than 3,000 US-led soldiers have been killed in Afghanistan since the US-led invasion of the country in 2001.
The poll comes after a recent report stated that the US-led military operations have inflicted over USD 100 million in damages on public property in southern Afghanistan.
Afghans also blame foreign troops and their military operations for civilian deaths. The rising number of civilian casualties has increased anti-US sentiments in the troubled region.
The surge in violence comes despite the presence of 150,000 foreign troops engaged in the so-called war on terrorism.
The war in Afghanistan, with civilian and military casualties at record highs, has become the longest war in the US history.