(FILES) In this file photo US Army soldiers attached to 2nd platoon, C troop, 1st Squadron (Airborne), 91st US Cavalry Regiment, 173rd Airborne Brigade Combat Team operating under NATO sponsored International Security Assistance Force (ISAF) protect a wounded comrade from dust and smoke flares after an Improvised Explosive Device (IED) blast during a patrol near Baraki Barak base in Logar Province on October 13, 2012. - US President Joe Biden will formally announce on April 14, 2021 the withdrawal of all US troops from Afghanistan before this year's 20th anniversary of the September 11 attacks, finally ending America's longest war despite mounting fears of a Taliban victory, officials said. The drawdown delays only by around five months an agreement with the Taliban by former president Donald Trump to pull troops, amid a growing consensus in Washington that little more can be achieved. (Photo by Munir UZ ZAMAN / AFP)