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Spc. Heath Johnson of 2nd Platoon, Easy Co. of the 2-506th Infantry Battalion of the 4th Brigade of the 101st Airborne Division is overcome by heat exhaustion during a mission with the Afghan National Army and Police in the remote Musa Khel district of Khost province Afghanistan, Wednesday, July 3, 2013. The 4th Brigade will be the last US combat brigade deployed to Khost, and will begin their withdrawal and complete turnover to Afghan forces this fall. Afghanistan faces an uncertain future as it's security forces prepare to confront the Taliban insurgency alone and political instability threatens to frustrate efforts for a negotiated peace.