are there other reasons for going to the war that O'Brien does not list?

O'Brien initially took off for Canada but never crossed the border. While out fishing, he almost decided to jumo but then imagined the following;

".... a huge crowd of people in the mountains around the river. O’Brien writes that he imagined his parents watching, his town watching, Linda watching, all of the people from his past and future watching him make his decision. He imagined being hunted down by the FBI. In the end he couldn’t bring himself to jump out of the boat. O’Brien cried, but told Berdahl to take him back to the lodge. He paid Elroy for the room and drove home to his parents. “I was a coward,” he writes. “I went to war.” (55)