Following the 9/11 attacks, the United States invaded Afghanistan to stop al-Qaeda using the country as its base. The mission was launched under the title of Operation Enduring Freedom (OEF).
Later, Nato's International Security Assistance Force (Isaf) was deployed in the country with a mission to promote security and development, as well as train Afghan soldiers and police.
At first the two missions had separate objectives, but over the years they have merged and are now under joint command. More than 50 countries have sent troops or reconstruction teams to Afghanistan. Many countries plan to withdraw their troops by 2015.
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