How about the US troops being secure in occupation as they were in Japan and Germany? Time for Iraq to vote for their leaders and us to come home.
The troops got rid of Saddam and ended any WMD threats to us. Mission accomplished. Iraq should work out their own salvation [it that's the right word].
Our troops in Germany and Japan were not secure for several years after the war. "Insurgents" in Germany were active during the early post war years -- we captured and killed many insurgent Germans after the war.
In this Iraq case, the war is not really over and in this type war they will remain active for much longer. The Iraq security is secondary to ours; but, that demands we stay for a much longer period -- leaving early will be a great if not fatal National move -- sadly, it will cost more American lives, but necessary for the long term.