Marine Corps Commandant Gen. James F. Amos, center, presents Defense Secretary Leon E. Panetta with a mameluke sword during the Commandant's Marine Corps Ball in National Harbor, Md., Nov. 12, 2011. The sword is carried by all Marine Corps officers and was first presented to Marine First Lt. Presley O'Bannon by the Ottoman Empire viceroy during the first barbary war. Marine Corps Commandant Gen. James F. Amos, center, presents Defense Secretary Leon E. Panetta with a mameluke sword during the Commandant's Marine Corps Ball in National Harbor, Md., Nov. 12, 2011. The sword is carried by all Marine Corps officers and was first presented to Marine First Lt. Presley O'Bannon by the Ottoman Empire viceroy during the first barbary war. SHARE IMAGE: Download Image: Full Size (0.61 MB) Tags: Photo Essays Photo By: VIRIN: 755991-M-KCG74-199.jpg Photo Gallery