US Army getting back in

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I would love to get back in the military but I have a problem. I have never been very good at running now that I have been out for 13 years I haven't done any running. I need to get back to being able to run 2 miles in under 18 minutes can anyone give me some advice on what I should do. This is the only thing preventing me from getting back in now and want to serve my country again.