Probably working out and being as physically fit as possible is a big one... being able to stick with a strict routine such as early bedtimes and early wake times is beneficial too. Making good grades is always a help and make sure you graduate high school and don't get into any kind of legal/criminal trouble. These things are obvious tho.
Believe it or not, you can google something like "prepare for the military" or similar and find lots of pages of info on exactly what you can do geared toward each branch of the service.
Good Luck to you!
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Knowledge is Power
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