WASHINGTON, DC – SEPTEMBER 22: U.S. President Barack Obama hugs family members during a memorial service for victims of the Washington Navy Yard shooting at the Marine Barracks September 22, 2013 in Washington, DC. The president and the first lady visited with families of the victims in the deadly shooting at the Washington Navy Yard. Thirteen people, including the gunman Aaron Alexis, were killed in the incident. (Photo by Alex Wong/Getty Images)