Note 4-B — CHAPTER 4 An Expanding War, 1962 The War’s New Context—Creation of MACV and Marine Advisory Division—The Vietnamese Marine Corps, 1962—Some Conclusions

COSVN apparently was established in March. Prior to this the NLF had functioned through two separate geographic headquarters—Interzone V, responsible for roughly the northern three-quarters of South Vietnam, and the NAMBO Interzone, responsible for the area roughly described by the forested hills and Mekong Delta physiographic regions.