The eternal flame burns atop at the gravesite of President John F. Kennedy at Arlington National Cemetery in Arlington, Va., Tuesday, Nov. 19, 2013. Friday, Nov. 22 will mark the 50th anniversary of Kennedy's assassinated in Dallas.  (AP Photo/Carolyn Kaster)

Photo by: Carolyn Kaster

The eternal flame burns atop at the gravesite of President John F. Kennedy at Arlington National Cemetery in Arlington, Va., Tuesday, Nov. 19, 2013. Friday, Nov. 22 will mark the 50th anniversary of Kennedy's assassinated in Dallas. (AP Photo/Carolyn Kaster)