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How Long Is Basic Training in the Marines? The United States Marine Corps is known as America's first line of defense. To become a Marine, you must be at least 17 years old at the time of enlistment and hold a high school diploma. You must also complete 12 weeks of intense training.
According to BJS, the median duration of basic recruit training - excluding any field training component - was 21 weeks across all academies with a range anywhere from four weeks to six months. Following is a summary of training topics, the percentage of academies providing each, and the median number of hours.