President Barack Obama is greeted by Col. Bradley Hoagland, 11th Wing and Joint Base Andrews commander, at JBA, Md., May 5, 2016. Obama visited the base to speak at the USO comedy show ‘A Celebration of Service.’ The event was hosted by comedian John Stewart and featured remarks from the President, Vice President, the First Lady and Dr. Biden. (U.S. Air Force photo by Airman Gabrielle Spalding/Released)