Dry Ice,
You are going to do everything all over again. You will do MEPS: ASVAB, Background Check and Physical (if not current, I think within a year). You will attend a prior service boot camp (Pit Stop) for a month in NJ. You will most likely be brought in as an E-3 until you go to A-school. Believe me, there is hardly a way around it. I was an E-6 in the Army and am in the process of doing a prior service enlistment in the USCG as an E-3. (Even though it is the same MOS {Rate}). You are going to have to really want to be a Coastie to enlist. The Coast Guard isn't like the Army; they don't seek recruits, they don't give bonuses, they don't guarantee jobs or stations. But I think it will be worth it to serve Americans and not Iraqis, mostly.