When the Soviet Union fell and relative peace began to break out all around the world, the corporations that make up the military industrial complex experienced less profit as militaries around the world began to scale back from the confrontation between the United States and the Soviets. They were still making profits, but not at the levels they were used to because peace is not as profitable as war, or the eternal threat of war. When the terrorists attacked New York, a new threat manifested itself and held promise for those who make money through war.
If you search Project for a New American Century Manifesto (PNAC), you will find a group of people who think that American style corporate capitalism, not democracy, is the most desired model for the rest of the world. Dick Cheney, Donald Rumsfeld and Paul Wolfowitz are initial signatories to the ideals put forth by PNAC. They are the ones who manipulated George Bush into waging the war in Iraq in such an incompetent way as to ensure a rapidly expanding terrorist threat and a long-term American military presence in the Middle East to confront it.
From too few troops to secure the peace of Iraq after major combat operations to diverting billions of dollars to corporate cronies instead of Iraqi-based rebuilding to ignoring the growing insurgency and sectarian civil war, the extension of the occupation was assured. This was done to ensure that the military industrial complex corporations would have an "eternal ware" to replace the taxpayer funded profits that were lost with the falling of the Soviet Union. I'd call that the real "Mission Accomplished."