Drill Instructor Definition

noun

A noncommissioned officer who instructs recruits in military drill and discipline.

American Heritage

(US) The generic term for the principal instructor of fresh military recruits undergoing basic training in the various branches of the United States military, routinely abbreviated to the initialism DI; always filled by enlisted personnel (a sergeant or petty officer).

Army: drill sergeant.

Navy: recruit division commander.

Marine Corps: drill instructor.

Air Force: military training instructor.

Coast Guard: company commander.

Wiktionary

Synonyms: