It seems noticeably absent compared to the World Wars that occurred before, and the Middle Eastern wars that occurred after
During WWI and WWII there was a credible case that could be made that the US was fighting a defensible war, in WWII we were directly attacked and during WWI because Germany had been directly threatening US shipping, there was a clear objective and people were actually encouraged to sacrifice, participate in the fight which I think added to the sense of seriousness. While the war on terror didn't have that aspect we had been directly attacked and that made for effective propaganda though it eventually became less popular because there was no clear objective.
Vietnam was kind of the worst of all possible worlds. It was an open ended commitment with no clear objective like Iraq, the Viet Cong had never attacked us in dramatic fashion like Pearl Harbor or 9/11 so even in a country as hysterically anti-communist as the 1960s US it was hard to make the case that it was worth the sacrifice and there were no disruptions to daily life except for the least popular one, the draft which radicalized an entire generation against the war.
