A pedestrian carrying an umbrella walks through a Memorial Day display of United States flags on the Boston Common in Boston, Massachusetts, May 23, 2013. [Photo/Agencies]

A man touches the Vietnam Veterans Memorial wall, etched with the names of more than 58,000 US servicemen and women who died in the war, in Washington, May 23, 2013. Memorial Day will fall on May 27 this year. [Photo/Agencies]