History of the U.S. Army Noncommissioned Officer Education System is a 1998 TRADOC NCO Leader Development Branch paper by Steve Ball.

History of the Fort Polk Noncommissioned Officer Academy is an article that covers the origins of the Fort Polk NCOA.

History of the U. S. Constabulary 10 Jan 46 – 31 Dec 46 is a 1947 Headquarters European Command manuscript.

History of the Seventh United States Army Noncommissioned Officer Academy is contained within an email between Dan Elder and Bob McCord.

History of the Drill Sergeant is a U.S. Army Drill Sergeant article that also includes the history of the campaign hat and ID badge.

History Chapter 4: 1964-1967 and Beyond is a 2014 US Army Garrison page from the fourth chapter of a larger text.

History of the Sergeant Major is an NCO Museum Staff article written by L.R. Arms about the origins of the Sergeant Major.

Historical Overview of the ATRADOC, Chapter 7 is the seventh chapter of a larger text. This chapter examines the history of TRADOC.

Here’s How Army Ranks Became the Way They Are is a lightly faded 1967 article explaining the rank system and history.