Moving to Fort Knox , Kentucky , the 1st Cavalry Regiment became the first mechanized unit in the United States Army .
Moving to Fort Knox , Kentucky , the 1st Cavalry Regiment was redesignated the 1st Armored Regiment of the 1st Armored Division on 15 July 1940 .
Moving to Fort Knox , Kentucky , the 1st Cavalry Regiment became the first mechanized unit in the United States Army , and was redesignated the 1st Armored Regiment of the 1st Armored Division on 15 July 1940 .