If I were a medic in the Army how hard would it be to become a RN (Registered Nurse) when Im out?

You don't need a 4 year degree, you can get an Associate's Degree and become an RN if you don't want to go for the BSN right away, as long as the program is accredited. While your Army medic experience will help in the practical sense, it won't give you any advantage when it comes to your education, you'll have to complete a nursing program just like anyone else in order to be eligible for your board exam / license. There may be a few non-nursing courses like biology, chemistry, and anatomy / physiology which might allow a "test out" option, but that's up to the individual school.

the same as every one else except you would have more experience equal to an LPN/LVN no short cuts for anyone some states if you wanted to challenge the boards LPN/LVN you may be able to skip the school/clinical parts

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