Here's how the longest war in US history has unfolded

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M249 squad automatic weapon machine gun Afghanistan

(AP Photo/Julie Jacobson)

US Marine Lance Cpl. Will Betz aims at Taliban positions after being fired upon during a patrol in Helmand Province, Afghanistan, August 28, 2009.

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Despite the combat mission in Afghanistan concluding in 2014, President Donald Trump said in a speech Monday night that he plans to increase the US's military presence in the war-torn country and continue the longest-running war in American history.

The 16-year war, once known as Operation Enduring Freedom but now called Resolute Support, has led to the deaths of 2,403 American soldiers, along with thousands of Taliban and Al Qaeda fighters - as well as thousands of Afghan civilians.

While Trump did not mention exact numbers for his troop-increase proposal, multiple reports say he plans on sending about 4,000 troops to join the 8,400 that are already deployed to Afghanistan.