Noncommissioned Officers Bibliography is a 2020 Ibiblio list of sources related to the history and training of NCOs.

Dan Elder Collection of Key Events Relating to ETO Training is a 2016 timeline written by Dan Elder about Army training.

What’s Happened to the NONCOM is a 1941 Infantry Journal article about how the Noncommissioned Officer has changed over time.

The Noncommissioned Officer the Backbone of the Army is a 1926 article written by Robert L. Bacon about NCOs.

The Three Meter Zone Email is a 1998 Presidio Press email between Robert V. Kane and Dan Elder about the Three Meter Zone.

Hints for Non-Commissioned Officers on Actual Service is an 1804 C. Boworth, Bell Yard, Fleet Street booklet by Colonel Sontag.

A Handbook for Infantry Containing the First Principles of Military Discipline, Founded on Rational Method.

Military Order of the Loyal Legion of the United States, A NCO Interview with President Lincoln 1907 War Papers booklet by Samuel K. Hall.