Should I join the Marine Corp before or after I attend college?

Once youre 18 it doesn't matter. Do what YOU want to do. I didnt join the Marines because my parents, friends, girlfriend wanted or didnt want me to. I did it because I wanted to. If you wanna come in and try to be an officer youre gonna have to get college first. If you have some college you can probably come in a contract PFC and skip private. Or you can join right away and work your way up through the enlisted ranks. No way is a bad way. Just do what you want to do.