A drill instructor is a person who trains and guides others, usually in the military, by teaching them specific skills and giving them orders to follow. Full definition
Perhaps you think they will be a former Marine drill instructor who still thinks they are in the Corps. (myimprov.com)
The best movie comparison I can offer for JK Simmons» portrayal of Terence Fletcher is R Lee Ermey's Drill Instructor in Full Metal Jacket. (moviereviewsfromthedark.com)
The state appropriated $ 100,000 to pay drill instructors for the 1917 - 18 academic year, but has now used up that amount. (saratogian.com)