Gyrene: Around 1900, members of the U.S. Navy began using Gyrene as a jocular derogatory reference to U.S. Marines. Instead of being insulted, the Marines loved it. The term became common by World War I and has been extensively used since that time.

What does Gyrene mean?

gyrene in British English

(dʒaɪˈriːn) noun. slang. a person who belongs to the US Marine Corps.

Where did the term Devil Dog originated?

We got our nickname Devil Dogs from official German reports which called the Marines at Belleau Wood Teufel Hunden. It has been said that this nickname came about from Marines being ordered to take a hill occupied by German forces while wearing gas masks as a precaution against German mustard gas.