During World War I the Fifth and Sixth Marines fought in France as the Fourth Marine Brigade of the US Army's 2nd Infantry Division were forced to wear the Army's uniform. The Marines had only the eagle, globe, and anchor on their soft covers to distinguish themselves from their Army brothers-in-arms.
During World War I, the Fifth and Sixth Marines fought in France while wearing the Army's uniform due to a requirement for the US Army's 2nd Infantry Division. The Marines used only the eagle, globe, and anchor on their soft covers to differentiate themselves from their Army counterparts.