31 January 1967
 CENTRAL INTELLIGENCE AGENCY
 Directorate of Intelligence
 MEMORANDUM
 North Vietnam's Military Position in the Southern DRV
 1. Over the last year and a half the North Vietnamese
 have considerably augmented their ground force
 strength in the southernmost part of their country. At
 present in this region, called Military Region IV (MR IV),
 the North Vietnamese are known to have five infantry
 divisions, two independent infantry regiments and numerous
 anti-aircraft artillery, logistics, border guard,
 armed public security and local force units as well as
 militia forces. The exact number of these latter units
 is unknown, although current OB places total DRV regular
 military strength in MR IV at about 105,000. All five
 of the divisions appear to be aligned, at least in part,
 for offensive or support operations in South Vietnam.
 Since most of our information on the location of units
 in MR IV is obtained from long and medium range radio
 direction finding, exact locations are impossible to
 ascertain. Furthermore, only the major headquarters of
 these units are obtainable from this type of information.
 2. Prior to the buildup in MR IV which began in
 early 1965, there were two infantry divisions and two
 independent infantry regiments in that area. Both of
 the divisions, the 324th and 325th, have provided cadre
 for newly formed divisions which have infiltrated into
 South Vietnam. The 325th has provided six regiments
 utilizing its own cadre, some taken from other units
 throughout North Vietnam and newly recruited personnel.
 Its current strength is unknown and it may be below
 TO & E strength.
 3. The 324th has provided three regiments to
 South Vietnam. These regiments are under a divisional
 headquarters called the 324 B Division. This "B"
 
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