Secretary Cohen responds to a question during a press briefing with Gen.. Shelton on Allied Force. Secretary of Defense William S. Cohen (left) responds to a reporter's question during a Pentagon press briefing with Chairman of the Joint Chiefs of Staff Gen. Henry H. Shelton (right), U.S. Army, on NATO Operation Allied Force, on March 24, 1999. Cohen announced the U.S. participation in the NATO air operation against targets the Federal Republic of Yugoslavia. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 322598-R-ILK57-232.jpg Photo Gallery