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US President Barack Obama (2R) and US Secretary of Veterans Affairs Robert McDonald (R) arrive at Andrews Air Force Base on August 1, 2016 in Maryland, after Obama spoke at the 95th National Convention of Disabled American Veterans in Atlanta, Georgia. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

US President Barack Obama (2R) and US Secretary of Veterans Affairs Robert McDonald (R) arrive at Andrews Air Force Base on August 1, 2016 in Maryland, after Obama spoke at the 95th National Convention of Disabled American Veterans in Atlanta, Georgia.   / AFP / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)