I highly recommend the new book about Tillman by the guy who wrote Into the Wild.
Lots of interesting narrative about the danger of friendly fire in a fast moving environment with so much firepower. While much better than not having enough mobility or firepower, it isn't perfect and good guys get killed sometimes.
But most interesting was the tracing of the arc of Tillman's life. He was certainly Type A, with talent and energy and aggression, but he had a curious mind, one that wasn't satisfied - ever. Money in no way dominated his thinking. He lived to find challenges and to defeat them. He lived in search of a purpose. He was frustrated by the wars and his unit and even his celebrity, but he was in it all the way, because he had given his commitment.
Great book and a great look into his life, as much as one can get.
The mission that got him killed was a waste of life, but the decisions that led to the result were not atypical and usually don't result in that kind of failure, other than perhaps just not having enough men for the tasks which does often get guys killed.
The coverup was, really, stupid and insulting. The idea was to insulate the war effort from the possible negative feedback of losing a celebrity in friendly fire, but the result ultimately was more distrust of the military, and that's too bad. Tillman's brother was on the scene at the time, and even he wasn't told the truth.
It takes a certain level of character and even oddness to live like Tillman did. He developed his own yardstick to measure himself, declining the one generally used (money). I'm sorry for him that his life ended so soon, and sorry for us to have one less of a rare breed.