Secretary Cohen answers a question during a NATO Operation Allied Force press briefing. Secretary of Defense William S. Cohen (right) answers a reporter's question during a Pentagon press briefing with Chairman of the Joint Chiefs of Staff Gen. Henry H. Shelton (left), U.S. Army, on NATO Operation Allied Force on April 29, 1999. Operation Allied Force is the air operation against targets in the Federal Republic of Yugoslavia. SHARE: Download: Full Size (0.02 MB) Credit: VIRIN: 816026-U-QHN12-712.jpg Photo Gallery