Page "Drill instructor" Paragraph 24
from
Wikipedia
* Drill Instructors in the United States Marine Corps normally hold the rank of Sergeant ( E-5 ) through Gunnery Sergeant ( E-7 ).
A Corporal ( E-4 ) is no longer authorized to attend Drill Instructor School therefore not authorized to hold the billet of a Drill Instructor.
Successful completion of Drill Instructor School grants the Marine an AMOS ( Additional Military Occupational Specialty ) of 0911.
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