When was the D.I introduced into the Marine Corps?

[Anthony]

Was it not long after the formation of the Marine Corps in 1775? When were they introduced

 

[ArmyChemo]

Here is the Drill Instructor School website that includes a history:

http://www.mcrdsd.usmc.mil/Drill_Instructors_School/default.htm

 

[Jamesson (RekonDog)]

I don't have the answer but I have some interesting fact about the DI cover--'cover' is "hat" in naval terms--the cover for uniform use actually originated from the Marine Corps in the early 1900's. Today, many drill instructors/sergeants use it for their drill uniform, in training newly candidates. The Army and many other paramilitary agencies in the U.S. wear the "smokey bear" cover. Traditionally, it's called the "campaign cover", from what I was told.