Bradley is most likely suffering from flashbacks associated with posttraumatic stress.
Flashbacks that Bradley is having is one of the severe symptoms of post traumatic stress. This mental health disorder is usually triggered due to the fact that a person has witnessed an event that was traumatic.
Bradley had fought in the war in Iraq. What he is experiencing now is due to the horrors that he witnessed on the battle field.
This is what is causing him to have flashbacks about the war that he has seen.
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