Of course Bob shot himself. He wanted to come home and get away from the craziness in Vietnam. He was embarrassed because he ended up being awarded the bronze star for it, which is why he never wanted to discuss it. All he wanted was to get out, and he ended up getting rewarded for being dishonorable. Even Sally, who is sort of laughingly questioning him about the event, is pretty sure he did it to himself. And therein lies an amazing comparison to the two men, Bob and Luke. Luke, of course, was injured "honorably" and came home permanently physically disabled. Bob injured himself "dishonorably" and came home only temporarily physically disabled, but obviously permanently and fatally psychologically disabled.
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