Secretary Cohen and Gen. Shelton brief Pentagon reporters on NATO Operation Allied Force. Secretary of Defense William S. Cohen (left) and Gen. Henry H. Shelton, U.S. Army, chairman of the Joint Chiefs of Staff (right) brief Pentagon reporters on their preliminary assessment of the effectiveness of NATO Operation Allied Force. Operation Allied Force was the air operation against targets in the Federal Republic of Yugoslavia. They also covered plans for the introduction of U.S. peace keeping forces into the Kosovo region. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 116935-Y-QVB13-312.jpg Photo Gallery