It was my duty to shoot the enemy and I don't regret it. My regrets are for the people I couldn't save: Marines soldiers buddies. I'm not naive and I don't romanticize war. The worst moments of my life have come as a SEAL. But I can stand before God with a clear conscience about doing my job.
I think failure is nothing more than life's way of nudging you that you are off course. My attitude to failure is not attached to outcome but in not trying. It is liberating. Most people attach failure to something not working out or how people perceive you. This way it is about answering to yourself.