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JOINT BASE ANDREWS, MD - SEPTEMBER 14: Transfer cases are carried into a hangar during the Transfer of Remains Ceremony for the return of Ambassador Christopher Stevens and three other Libyan embassy employees September 14. 2012 at Joint Base Andrews, Maryland. Stevens and the three other embassy employees were killed when the consulate in Libya was attacked September 11. (Photo by Molly Riley-Pool/Getty Images)

JOINT BASE ANDREWS, MD - SEPTEMBER 14:  Transfer cases are carried into a hangar during the Transfer of Remains Ceremony for the return of Ambassador Christopher Stevens and three other Libyan embassy employees September 14. 2012 at Joint Base Andrews, Maryland. Stevens and the three other embassy employees were killed when the consulate in Libya was attacked September 11.   (Photo by Molly Riley-Pool/Getty Images)