• Veterans remember fallen comrades at the Vietnam Veterans Memorial Wall during The Rolling Thunder First Amendment Demonstration Run in Washington, DC, on May 24, 2015. The Rolling Thunder First Amendment Demonstration Run is an annual event to pay tribute to current and former US military members. (Photo credit CHRIS KLEPONIS/AFP/Getty Images)

    Vietnam Veterans Make Emotional Visit To The Wall

  • WASHINGTON, DC - APRIL 15:  U.S. Capitol Police are seen at Peace Circle after a gyrocopter has landed on the West Lawn of the U.S. Capitol April 15, 2015 on Capitol Hill in Washington, DC. Doug Hughes, a 61-year-old postal worker from Ruskin, Florida, landed the lightweight helicopter on the Capitol lawn to protest against government corruption and to promote campaign finance reform. (Photo by Alex Wong/Getty Images)

    Pressure Cooker in Suspicious D.C. Vehicle Destroyed

  • US President Barack Obama lays a wreath at the Tomb of the Unknowns during Memorial Day ceremonies on May 25, 2015 at Arlington National Cemetery in Arlington, Virginia. Memorial Day, originally called Decoration Day, is a day of remembrance for those who have died in service of the United States of America.   AFP PHOTO/NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

    Obama Pays Tribute to Fallen Service Members

  • Tanner Roark #57 of the Washington Nationals pitches against the Chicago Cubs during the first inning on May 25, 2015 at Wrigley Field in Chicago, Illinois. (Photo by David Banks/Getty Images)

    Roark, Ramos Lead Nationals Past Cubs 2-1

  • Soldiers Of The 3rd U.S. Infantry Regiment Hosts Annual Flags-In Ceremony At Arlington Cemetery

    Memorial Day Guide