More broadly, along with Ambassador Ellsworth Bunker and Military Assistance Command, Vietnam (MACV) commander General Creighton Abrams, Colby was part of a leadership group that worked to apply a new approach to the war designed to focus more on pacification (winning hearts and minds) and securing the countryside as opposed to the "search and destroy" approach that had characterized General William Westmoreland's tenure as MACV commander. Some, including Colby later in life, argue that this approach succeeded in reducing the Communist insurgency in South Vietnam, but that South Vietnam, without air and ground support by the United States after the 1973 Paris Peace Accords, was ultimately overwhelmed by a conventional North Vietnamese assault in 1975. The CORDS model and its approach influenced U.S. strategy and thinking on counterinsurgency in the 2000s in Iraq and Afghanistan.