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When you get out they won't remember you, or care that you served for 4 years. Ask me how I know?
This is the saddest part. We had people in HS and college come back to our rinky dink town with a "so, what now?" bravado, and when they came back, people wondered "so what?".
There's a worker in our building who served gulf and came back, served Afghanistan and came back. His job was protected both times. Be sure to do your research to be sure this can still be done (and how). This was already 10 and 20+ years ago.