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Colonel Definition & Meaning - Merriam-Webster
Colonel - Wikipedia
Colonel (United States) - Wikipedia
U.S. Army Ranks
COLONEL Definition & Meaning | Dictionary.com
Colonel | Army Officer, Commanding Officer, Regiment | Britannica
COLONEL | English meaning - Cambridge Dictionary
COLONEL | definition in the Cambridge English Dictionary
Army Colonel - Military Ranks
U.S. Military Rank Insignia - U.S. Department of Defense