First off, you have to understand what psychological alienation means is means to be in a state, where one feels isolated from a group or an activity which one would normally belong or be involved with, that affects the mental and emotional state of a person. So you're trying to find what sentences reflect a feeling that the narrator believes they do not belong among those who had not been in the war and experienced the same things you can see there is a lot of "us" and "them" Psychological alienation refers to all of the soldiers feeling isolated from society.One example is , "We felt held together by there being something that had happened that they, the people who disliked us. HOPE THIS HELPS A LITTLE BIT
The three friends used to be 'bad boys'. They believed that they could do many things. After seeing the presentation, they believed that they could accomplish really anything.