Strike Back season 5

The main character of the series, John Porter, has experienced a lot. He failed operation in Iraq, and his subordinates and friends died. His command did not forgive such a blunder and accused him of failing. Blame was his humanity that he showed during the quest. Failed commander who lost friends, John have fall into depression. He does not know what to do in civilian life. His whole life was dedicated to the service, but now he has a second chance to return to a favorite cause. But would it be the past interfere with the performance of commands?