The War in Afghanistan By the Numbers

PHOTO: US soldiers part of NATO patrol during the final day of a month long anti-Taliban operation by the Afghan National Army (ANA) in various parts of eastern Nangarhar province, at an Afghan National Army base in Khogyani district, Aug. 30, 2015. PlayNoorullah Shirzada/AFP/Getty Image
WATCH President Obama With a Major Reversal on Afghanistan

Today's announcement that more American troops will be staying in Afghanistan longer than expected effectively extended the war that President Obama had hoped to end during his administration.

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Cited as reasons for the major policy change were the renewed presence of the Taliban in certain areas of the country, like the city of Kunduz, the need to continue targeting the terrorist threat posed by al Qaeda and ISIS, as well as continuing to provide specialized training for Afghanistan’s security forces.

Here's a look back at America's involvement in Afghanistan since the start of the war and how the U.S. military's presence has changed over time.