That's your problem. Vietnam lasted over a decade. We haven't completed two years in Iraq yet.
Until about year 4 of Vietnam, the average US casualty was less than the average we are getting in Iraq right now. THEN it started to skyrocket. It took about 4 and a half years for Nam to reach 1000 casualties, we have done it here in less than two.
Look at this page to see some pretty graphs detailing this.
Now that we have set up this government for Iraq, I count casualties of the Iraqi 'government' with our total. Resistance militants blew up 56 applicants to the Iraqi police force yesterday.
Deaths are still flying past at a rapid clip over there.
You should also include our considerably large number of wounded when comparing Iraq to Vietnam. Our wounded's lives are horribly altered forever. We have just short of 6000 wounded now.