I can't think if a clever title.

Johnny Got His Gun lacks one element that is so often used when talking about war, god. March Of The Flag proposes the idea that America goes to war to expand, America expands because god wants us to. The lack of god in Johnny Got His Gun isn't something that I personally would have thought about when considering war. Although Joe seems to have a great deal of revelations about his life, no mention of a religion ever comes into play.