Why are there two E-8 ranks in the Marine Corps? What’s a MSgt? What’s a 1stSgt? What’s the difference? After you’ve been promoted to GySgt, the Marine Corps splits the path forward for E-8 and E-9. The Corps decides if you’ll become a 1stSgt or a MSgt, depending on #theneedsofthecorps #urah #SemperFiMyFriends #marines #marinecorps #SFMF #ELI5USMC