 When the pentatonic concept gave way to the Reorganization Objective Army Division (ROAD), with brigades and battalions instead of battle groups, the 2nd Airborne Battle Group, 501st Infantry was reorganized and re-designated as the 2nd Battalion, 501st Infantry.On 1 February 1964, its colors were relieved from assignment to the 82nd and assigned to the 101st at Fort Campbell, KY.The 101st was also reorganized as a ROAD airborne division, and the 1st Airborne Battle Group, 501st Infantry became the 1st Battalion, 501st Infantry, of the 101st.