New Novel Idea- Stockholm Syndrome.
After a successful recovery mission (of a hostage), the evacuation copter is shot down after pickup. All but a few are dead. One marine watches in horror as the insurgents that shot them down move in and execute the wounded. He is last, the barrel of a gun pressed against his head. The executioner is about to pull the trigger when the insurgent leader orders him to stop, he apparently sees something in this marine. The marine is taken prisoner instead. After several years of imprisonment, the captured marine comes down with Stockholm Syndrome (These men saved his life, they could have killed him like the rest). He rises through the insurgent's ranks, committing brutal war crimes along the way, and eventually becomes their leader. He then goes on to orchestrate a major (successful) attack on the U.S.
First or third person? I'm thinking first.