Secretary Cohen escorts President-elect Olusegun Obasanjo of Nigeria into the Pentagon. Secretary of Defense William S. Cohen (right) escorts President-elect Olusegun Obasanjo of Nigeria through an honor cordon into the Pentagon on March 30, 1999. The two men will meet to discuss African security issues. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 391788-Y-SIJ83-762.jpg Photo Gallery