Why are yesterdays heroes still important today? (it's supposed to be about people in the military who served in iraq)

Well in the past after 911 we had to go into Iraq to maintain peace and order for both the people who reside there and the rest of the world to try to control terrorism and dictatorships from using weapons of mass destruction , for example Saddam Hussain , & Gadaffi. Today it is needed now more than ever due to the escalated amount of terrorists attacks reoccurring and terror cells sich as ISIS located in many Middle Eastern countries such as Iraq.