I'm 15 and i just found out im near sighted and need gles. Can I still join the army or marines?

yes you can as long as your corrected vision is 20/20. At one time you were not able to be a pilot if you wore gles, how ever I have been away from the military for a long time as far as knowing the criteria, maybe you can be one now with contact lenses.You are a little premature, in asking but you might b ROTC in which case your instructor will be able to advise you.