'God bless these American heroes,' Obama says in day of tribute, remembrance for fallen

President Barack Obama delivers a speech at the 116th National Convention of the Veterans of Foreign Wars, on Tuesday, July 21, 2015, in Pittsburgh.

NASHVILLE - President Barack Obama on Tuesday honored four Marines and a Navy petty officer killed in Chattanooga last week during a gunman's rampage, telling the nation, "God bless these American heroes."

Flying the flag at half-staff

According the U.S. Flag Code, the president will order the flag flown at half-staff "upon the death of principal figures of the United States government and the governor of a state, territory or possession." After the deaths of other officials or foreign dignitaries, the flag may be flown at half-staff at the president's discretion.