WASHINGTON - President Bush's father responded to a personal letter from his son's Texas Air National Guard unit commander soon after the younger Bush enlisted, according to documents released late Friday, fueling new claims from Democrats that he got special treatment. On Sept. 11, 1968, George H.W. Bush, then a congressman from Houston, wrote: "That a major general in the Air Force would take an interest in a brand new Air Force trainee made a big impression on me." The letter, in response to one from Maj. Gen. G.B. Greene, was released by the Pentagon along with other Bush military...