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Colonel (United States) - Wikipedia
Army Colonel - Military Ranks
Lieutenant colonel (United States) - Wikipedia
Colonel - Wikipedia
U.S. Army Ranks - The Official Home Page of the United States Army
U.S. Military Rank Insignia - U.S. Department of Defense
American Colonels | Origins of the Colonels - Military
Army Promotion to O-6 Colonel - Military Ranks
Colonel & U.S. Army Ranks | List & Branches | Study.com
U.S. Army Ranks List - Lowest to Highest - FederalPay.org