I've always wanted to be in the military and now it's about time to choose what I want to do. I want to be an Army Ranger, but then I get this feeling that I will regret not joining the Marines. If I join the Marines first, I get a feeling that I will regret not becoming a Ranger. So I've been thinking. Maybe join the Army for 3 years (after 4 years of ROTC in college) and once that is done, join the Marines. Do many people do this? Would I get any advantages joining the Marines after the Army? What do you think of this?