Infantry grunts for the Navy.
The United States Marine Corps is part of the US Navy, despite the Marines' fervent claims to the contrary, and despite the fact their paychecks clearly
state "Department of the Navy", not "USMC
Marines serve two functions: 1) Catching bullets
2)Poking mines with a stick
. When there is a battle where heavy casualties are expected, the Marines are sent in... to be grist for the mill.
Guy 1: I'm a Marine
Guy 2: Oh, you're in the Navy
Guy 1: What? Fuck you! I'm no swabbie fag! I'm a goddamn Marine!
Guy 2: I know. The Marines are part of the Navy, didn't you know that?