Secretary Cohen and Gen. Zhang sign an agreement on environmental protection. Secretary of Defense William S. Cohen (seated left) and Gen. Zhang Wannian (seated right), vice chairman of the Central Military Commission, Peoples Republic of China, sign an agreement on environmental protection at the Pentagon, on Sept. 15, 1998. The document signed today commits the two nations to exchange information on how best to minimize the environmental impact of military training operations. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 918340-B-RYG38-535.jpg Photo Gallery