wear a t-shirt that said i am going to attack fort hood tomorrow. how did the united states army and fbi miss the enemy within. do you believe the massacre could have been prevented? i do. that s the painful conclusion. there was a failure to act. the obama administration says no purple hearts will be avoided. what happened at fort hood almost 3 years ago should be addressed in the context of a broader threat of workplace violence. the big question is, why didn t anybody ever blow the whistle on hassan? i am bill hem mer. i am katherine jarrett. i am greg begun feld we are here on this episode of fox files. i wanted to help soldiers and i wanted to work in mental health. hiidaho native shawn manning comings with a family of a proud tradition of serving the nation. my father wgrandfather was i jemaah world war ii was a marine. he drove a tank. he was proud i joined the military. it was in october of 1999 when the 23-year-old followed in his grandfat