A devil dog is a member of the United States Marine Corps. It originates from a statement attributed to the German High Command, in remarking on the determinedness of the
Marines, to the effect of "
Wie sind die Teufelhundern ?", which means "Who are these
Devil Dogs?"
The
Marines have taken the comment as a compliment to their fighting ability, and refer to their
comrades as "
devil dogs": "hey there, devil dog" is a friendly greeting between Marines.