There hasn't been a military draft in the United States since 1972. With the scaling back of the all volunteer army currently stationed in Iraq and the public's opinion of the war in Iraq, there most likely will not be forced military service any time soon.
I'm going to tell you how to dodge a draft any which way because apparently people still want to know.
This by no means is a reflection of my personal views on the subject nor do I advocate dodging a draft. This is at best merely informational. User assumes any risk for actually being stupid enough to try any of this should the opportunity ever arise.
Step 1: Legal channels
The first way to dodge a draft is to go about the matter legally. For instance, in the United States, upon being drafted, a young man can file for conscientious objector status with selective services. He can then go in front of the draft board and plead his case as to why he should not be drafted based on religious or moral grounds. However, objection to a particular war is not grounds for objection; the objection must be made against all wars. Most individuals that claim conscientious objector tend to fail their board hearing since there is no clear grounds on what constitute conscientious objectors and most drafts are instated at times of need.
Step 2: Slightly Less Legal Channels
If you can't dodge the draft through legal means or based on personal convictions as a pacifist, you can try to be declared physically unfit for service. Go to your doctor and get a thorough checkup for any possible deformity or ailment that may prevent you from being cannon fodder. If he finds something, have your doctor write you a note to the draft board. If he doesn't and he's nice he will make something up and write the note on your behalf any which way. Keep in mind that the military will most likely conduct their own physical and if it should be deemed that you are lying, well then you are just out of luck.