Re-up—to re-enlist at once.
Rookie—a new recruit.
Sand-rat—an officer or soldier on duty in the rifle pit at target practice.
Saw-bone—the doctor.
Shave-tail—a new second lieutenant. So called, after the young, unbroken mules in the Quartermaster's Department.
Shoved up—to pawn.
Shutters—camphor or opium pills.
Sinkers—dumplings.
Sky-scout—the chaplain.
Sky-pilot—the chaplain,