The mass shooting at Fort Hood nearly two weeks ago has everyone from military experts to the Department of Homeland Security looking for answers from alleged gunman Nidal Malik Hasan. The incident is striking a chord with one Maine psychiatrist in more ways than one. Dr. John Campbell, now the Medical Director of General Psychiatry at Maine Medical Center, was stationed with the U.S. Air Force in Texas --- a military psychiatrist, like Hasan. And it was 15 years ago when a discharged airman he once treated went on a rampage in Washington state, fatally shooting six people.