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All enlisted personnel go through boot camp (even Officers go through their version of bootcamp as well, not to get too side-tracked...)
Bootcamp is the very first basic military training. Before you are any medical enlisted job, you are a military personnel first and need that essential basic military training. (Not to mention, if you can't cut it with basic military tasks/orders/fitness level, THAT is where you get weeded out)
Depends what you come in as. If you join with a professional level degree (MA or MD or PhD)- physician, Psychologist, veterinarian, dentist, physician assistant then you often can be direct commissioned.
For lower level medical such as medic or dental tech or nurse or whatever, then you will come in the same way everyone else and go through enlisted or officer boot camp.
While I have known doctors who received a direct commission as an officer in the Medical Corp, they still had to go through a modified Basic to understand military culture.
Additionally, consider for a moment the role of the Medic in a frontline unit --- would you really want to depend on an individual who had not undergone the physical training to enable them to keep up with the people who depend on them?
Realize to that Boot Camp isn't all physical. Much of the training has to do with learning the culture so that you will be able to function effectively as you start your ultimate job.
All enlistees are required to go thru initial entry training before going through their occupational training