Unfortunately, at least IMHO, its not going to be as easy to get out of Iraq as it was it was getting out of Vietnam.
Basically, both Vietnam's were way out in left field and amounted to more a proxy war struggle between the super powers of Russia and The USA. And as a domino theory strategy, the USA supposedly had to stop the spread of communism in South east Asia. And if we didn't stop it in S. Vietnam, all the rest of the neighboring countries would fall.
At the time, China was not the economic power it is now and was basically ignored. But China did set the ground rules by stating that if the US put boots on the ground to invade North Vietnam, China would come in on the side of North Vietnam. And since China had done the same in Korea, it was fresh in the military mind regarding what happened when the US went from liberating South Korea to invading North Korea. And as the USA and the UN topped the next hill in North Korea, surprise surprise, they found the entire Chinese army coming at them. An experience the USA was not willing to risk repeating in North Vietnam. But in the ground rules, it was permitted to attempt to bomb North Vietnam back to the stone age while we lost up to 300 troops per week in the South.
The gist of it is after years of making no headway, Nixon simply adopted the McGovern peace plan, renamed it peace with honor, we proclaimed yippee we won, and sailed home. The domino theory ended up being a crock of bull, Communism did not bag the lot, but it did end up destabilizing all the regional governments. And with Cambodia, the Vietnam war was one of the root causes of the killing fields of Cambodia. In the end analysis, Vietnam was a football to struggle over and the game needed the football. As soon as the game was over, no one wanted the football. And today Vietnam is still way out in left field as they struggle to join the global economy.
Iraq is not out there in left field and is coveted by everyone because of its oil. As it is, its an artificial country that never should have been because of all its ethnic divisions. And simply put together by the British after WW1 from the left over bits of the failed Ottoman empire. Iraq's Kurd's threaten the Turks, its Shias will tend to ally with Iran, and any Iraqi Iran alliance along Shia lines dangerously isolates Saudi Arabia. And Saudi Arabia will not passively sit back and watch the Sunnis in Iraq get butchered in ethnic cleansing. Meanwhile everyone in the region hates Israel which hardly helps the USA. And after five years of Iraqi anarchy with no end in sight, no stable or predictable Iraq
seems to be emerging. As long as the US stays thereby bringing some order to the quagmire, the worse case fears of the regional governments will be held in check. The second the US leaves, every country in the region will want a piece of the corpse. And if nothing else, the motivation will be to prevent their neighbors from grabbing it first. And did I forget to mention the near by Persian Gulf? If the gets blockaded, we are talking instant world wide depression as the economy of most oil based economies will grand to a halt.
The lesson to be learned---be careful of what small man you pull out of the crowd to thrash thereby proving how tough you are. Some come from left field and others are right there in the center of thing. And some are like the main support beams in a building, cut those and everything falls down.
Can GWB pick em or what---it amounts to at least the bone head play of the century. We thrashed Iraq easily but now what? Fools went where angel fear to thread. And now we are damned if we do and damned if we don't. Its going to take some very smart long term diplomacy to get out of this mess. The Condi Rice pretend Iran does not exist is not working.