It is difficult, and perhaps impossible, to separate the impacts of the war in Iraq from the impacts of the 9/11 attacks and the overall "War on Terror."
The cultural effect that seems most closely tied to the war in Iraq is the hugely increased amount of support for the military that is expressed in the US today. Since the war in Iraq started, we can see all sorts of ways in which we profess to love and appreciate those who serve in the Armed Forces. We see service members being interviewed and filmed watching NFL games from their posts abroad. We see Girl Scout troops doing cookie sales in which people can pay their money and have the cookies sent to service members. These sorts of expressions of gratitude have become a much more visible part of our culture since the beginning of the war.
The war in Iraq has had many effects on the United States culture. The war in Iraq has been one of the longest lasting wars that the United States has participated in. Many times people are not sure if it is even over or not, because it seems like almost every major news headline the past few years has something to do with terrorists or United States troops in the Middle East. Many troops have been there for many long years, and a lot of their families and just the American population in general feels that our troops should be pulled out of the Middle East and brought back home. All over you see billboards, TV commercials, advertisements in magazines and newspapers, all saying to bring our troops home. Also, the Wounded Warrior Project has more recently shown commercials and advertised with Iraq veterans, showing the impact the war has had on them.