How many years of school to join the army

You only need a high school diploma or GED to become an enlisted member of the military. You need a Bachelors degree (4 years of college) to become an officer.

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Get a High School Diploma or a GED and get a good score on the ASVAB test. Call a recruiter to know more. If you want to be an officer you should ask about ROTC. To become an officer you can go to a Commissioning School like West Point or Norwich University, many colleges have ROTC programs, there are also OCS which if you already have a degree can be another path and direct commissions but in recent history they have only been given to accomplished soldiers with years of enlisted time.

If you are interested call a recruiter because they will have the most up to date information of the options and career available to you.

If you would like to start your career in the military early you do not need to go to college to join the Army. Having a college degree prior to joining would be beneficial because you can potentially join as an officer once you have your college degree.