 Following the end of Westmoreland's command of the 101st in 1960 he recommended the pentomic structure be abolished.When the U.S. Army division was reorganized under the Pentomic structure in 1957, the traditional regimental organization employed by the Army was to be eliminated.This raised questions as to what the new units were to be called, how they were to be numbered, and what their relationship to former organizations was to be.