How long does it take to be a corporal in the Marines? On average, one can expect to be promoted with the following time-in-service: Private First Class (E-2) – 6 months. Lance Corporal (E-3) – 14 months. Corporal (E-4) – 26 months. What does it mean to be a corporal in the Marines? Corporal (Cpl/E-4) […]
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