Indeed, PAVN was doing just that. Two regular divisions (and later elements of a third) were moving toward Khe Sanh, eventually surrounding the base and cutting off its only road access. Westmoreland, contrary to the advice of his Marine commanders, reinforced the outpost. As far as he was concerned, if the communists were willing to mass their forces for destruction by American air power, so much the better. He described the ideal outcome as a "Dien Bien Phu in reverse". MACV then launched the largest concentrated aerial bombardment effort of the conflict (Operation Niagara) to defend Khe Sanh. Another massive aerial effort was undertaken to keep the beleaguered Marines supplied. There were many comparisons (by the media, Americans military and political officials, and the North Vietnamese) to the possibility of PAVN staging a repeat of its victory at Dien Bien Phu, but the differences outweighed the similarities in any comparison.