A new recruit is about to step onto the yellow footprints — only he needs four of them, and they need to be paw-shaped. Rct. Chesty XIV, the new Marine Corps mascot, met his drill instructor, Sgt. Chesty XIII, for the first time this month. And judging by the look on the sergeant’s face, it seems he’s prepared to use some serious knife-paws on the pup. Rct. Chesty will fill a long line of English Bulldogs who represent the Marine Corps. He’ll likely meet important players like the commander in chief and the defense secretary, which is why he’ll need…