As a mark of respect for the memory of John Christopher Stevens, United States Ambassador to Libya, and American personnel killed in the senseless attack on the American diplomatic facility in Benghazi, President Obama has ordered the flag of the United States to be flown at half-staff at the White House and upon all public buildings and grounds, at all military posts and naval stations, and on all naval vessels of the Federal Government in the District of Columbia and throughout the United States and its Territories and possessions on 09-12-2012 until sunset 09-16-2012.