We fought a war against Iraq, conducted no fly zone operations over them for 12 years, fought another war, occupied them for 9 years, left and came back less than 3 years later for another 7 year long military operation against the terrorist group that filled the power vacuum. We still have about 2500 troops stationed in Iraq.
Thank you for the additional examples of things not simply shutting down after a quick conflict. Lasting peace requires decades of military involvement. That is my point.