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As many Marines know, promotion varies depending on your military occupational specialty and Marine Corps-wide advancement standards. Factors that determine promotion include a cutting score for a specific field, proficiency and conduct, and individual effort. Lance corporals looking to advance to the rank of corporal are required to complete the Lance Corporal Leadership Ethics Seminar according to MARADMIN 521/14. - As many Marines know, promotion varies depending on your military occupational specialty and Marine Corps-wide advancement standards. Factors that determine promotion include a cutting score for a specific field, proficiency and conduct, and individual effort. Lance corporals looking to advance to the rank of corporal are required to complete the Lance Corporal Leadership Ethics Seminar according to MARADMIN 521/14.