As you saw intuitively, he has been masking his role in that war by describing himself as a medic when in fact he has been a combat soldier all along in his service. He is simply wanting to look more palatable to friends and family. In response to his inner reservations and qualms about the nature of what he was called on to do, and did, this is typical that people have soul wounds as a consequence of serving the armed forces, particularly when called into action and take the lives of others, things can readily reach a level of barbarity and depravity that will leave lifelong scars and beyond.
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