WASHINGTON - The Pentagon Friday released more documents on President Bush’s Vietnam-era Air National Guard Service, including a letter from his then-congressman father George Bush thanking a general for “taking interest in a brand new Air Force trainee.” Dozens of pages of documents, including historical records of the Air Guard unit in which Bush served, were released on orders from the White House. His National Guard service, which critics have charged was performed to avoid going into combat, has become an issue of contention in the presidential race. “That a major general in the Air Force would take interest in...