 Complete the following phrase:  The Airborne Division, alongside the Vietnamese Rangers and the Marine Division were often regarded as among the most effective units, with former airborne advisor General Barry McCaffrey noting that those of us privileged to serve with them were awestruck by their courage and tactical aggressiveness. The senior officers and non-commissioned officers were extremely competent and battle-hardened. Eight of nine battalions and three headquarters had earned US Presidential Unit Citation United States of which eight of these were earned by the Airborne between 1967-1968 which included the Tet Offensive period. Airborne commanders were often highly rated, with Airborne Commander Ngô Quang Trưởng once described by former Airborne-adviser and 