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ARLINGTON, VA - AUGUST 21:  U.S. President Donald Trump delivers remarks on Americas military involvement in Afghanistan at the Fort Myer military base on August 21, 2017 in Arlington, Virginia. Trump was expected to announce a modest increase in troop levels in Afghanistan, the result of a growing concern by the Pentagon over setbacks on the battlefield for the Afghan military against Taliban and al-Qaeda forces.  (Photo by Mark Wilson/Getty Images)
ARLINGTON, VA - AUGUST 21:  U.S. President Donald Trump delivers remarks on Americas military involvement in Afghanistan at the Fort Myer military base on August 21, 2017 in Arlington, Virginia. Trump was expected to announce a modest increase in troop levels in Afghanistan, the result of a growing concern by the Pentagon over setbacks on the battlefield for the Afghan military against Taliban and al-Qaeda forces.  (Photo by Mark Wilson/Getty Images)

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