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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.
Aside from basic marksmanship, they dont get a lot of combat training, its why they send their recruits to an additional school after basic to learn how combat arms techniques. Marines have a few weeks in boot camp plus 8 weeks of SOI (for infantry it's not for everyone, like the 14 weeks OSUT for army) Other MOS wise army has 8 weeks combat training in basic, plus whatever job combat training needed afterwards based in the MOS. Marines have their few weeks in boot camp and 3 weeks afterwards.