National Security: On the eve of a visit by China's No. 2 ranking military officer, the Obama administration loosens export controls on technology that will benefit Chinese missile development. It's deja vu all over again. The Pentagon has announced that Chinese Gen. Xu Caihou will visit the United States and meet with Defense Secretary Robert Gates on Oct. 26. Xu is vice chairman of the People's Liberation Army Central Military Commission. While here, Xu will visit American military installations around the U.S., including the U.S. Pacific Command. Perhaps Xu will bring with him a note of thanks for the administration's...