The following are the basic requirements for joining, and you must:
To enlist, you must be a U.S. citizen or a resident alien. Be between the ages of 17-34. Seventeen-year olds need parental consent. With very rare exceptions, you must have a high school diploma. Take and pass the Armed Services Vocational Aptitude Battery (ASVAB) test. Pass a Military Entrance Processing Station medical exam. Women are eligible to enlist in all occupational fields, with the exception of serving in the Navy Seals or on submarines.