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You will need at least a high school diploma in order to join the armed forces, and a college-preparatory curriculum is recommended. High school courses in science, mathematics, physics, computers, and physical education will be the most helpful. It's also a good idea to take a foreign language, which may expand your job opportunities. To enter the military, you must be at least 17 years old. Applicants who are 17 years old must also have the consent of a parent or legal guardian.