"As of January 1, 2015, the United States and its partner countries have completed a transition to a smaller post-2014 mission consisting mostly of training the Afghanistan National Security Forces (ANSF), which lead security operations throughout the country. The number of U.S. forces in Afghanistan, which peaked at about 100,000 in June 2011, has been reduced to just over 10,000, of which most are trainers and advisers as part of a 13,000 NATO-led 'Resolute Support Mission.' […] The post-2016 U.S. force is to be several hundred military personnel, under U.S. Embassy authority. However, doubts about the ability of the ANSF to operate without substantial international backing have led to recent U.S. alterations of the post- 2014 U.S. rules of engagement and debate over the size of the post-2016 force. […] As part of a longer term economic strategy for Afghanistan, U.S. officials seek greater Afghan integration into regional trade and investment patterns as part of a 'New Silk Road,' and say that Afghanistan might be able to exploit vast mineral resources. Still, Afghanistan will remain dependent on foreign aid for many years. Through the end of FY2013, the United States provided nearly $93 billion in assistance to Afghanistan since the fall of the Taliban, of which more than $56 billion has been to equip and train Afghan forces. The appropriated U.S. aid for FY2014 is over $6.1 billion, including $4.7 billion to train and equip the ANSF, and the FY2015 request is about $5.7 billion. These figures do not include funds for U.S. military operations in Afghanistan. Administration officials have pledged to Afghanistan that economic aid requests for Afghanistan are likely to continue roughly at recent levels (about $1.5 billion per year) through at least FY2017."
CRS Report for Congress, RL30588
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html