366. Memorandum From the Director of the Defense Intelligence Agency (Carroll) to the Secretary of Defense (McNamara)1

S-18982/P-3

SUBJECT

  • (S) THE VIET CONG IMPROVED COMBAT EFFECTIVENESS AND INSURGENCY POSTURE
1.
The attachment is an assessment of the Viet Cong’s military capabilities in the Republic of Viet-Nam, with emphasis on factors most likely to affect the Viet Cong insurgency effort.
2.
This information has been provided to the Chairman, Joint Chiefs of Staff, and to interested elements of the Joint Staff.
Joseph F. Carroll
Lieutenant General, USAF

Attachment

THE VIET CONG IMPROVED COMBAT EFFECTIVENESS AND INSURGENCY POSTURE

The government has apparently been unable to materially reduce the strength of the Viet Cong in spite of the increased number of RVN offensive operations. The Viet Cong by and large retain de facto control of much of the countryside and have steadily increased the overall intensity of the effort. In 1963, the Viet Cong have effectively harassed RVN lines of road and rail communications; developed their main force units; conducted intensive psychological warfare campaigns; effectively harassed and terrorized a large portion of the population along the northern and central coastal plains (although primary enemy emphasis remains in the delta region); varied the intensity and scale of their armed attacks against strategic hamlets almost at will; and, in general, have maintained a high level of guerrilla activity. To date, [Page 708] with few exceptions, deployments of RVN military forces in selected areas have not been able to compress the enemy into manageable pockets and destroy him.

While increasing RVN operational activity may demonstrate positive results in the near future, up to the present time the Viet Cong have stood off a better equipped army composed of regular and paramilitary forces totalling about 500,000 men; nearly five times the maximum estimated strength of the Viet Cong hard-core and irregular forces.

Statistically, the number of Viet-Cong initiated incidents, including armed attacks, shows a definite trend upwards since February 1963 and in general has remained above the 1962 monthly average since August. There has been generally less fluctuation in monthly large-scale attacks in 1963, averaging about 12 per month, than in 1962. RVNAF weapons losses have risen over the past year. Thus far, approximately 2,400 modern weapons have been lost, 900 of these in November alone. On the other hand, Viet Cong weapons losses have gradually declined.

On the other hand, the casualty rate and particularly the KIA ratio continues to favor government forces. Estimated Viet Cong casualties in 1963 through November total approximately 27,000 (20,000 KIA), more than the maximum strength of the Viet Cong main force figures carried by COMUSMACV (21-23,000) or almost one-half of the estimated Viet Cong irregular strength (60-80,000). The casualties may have been over-estimated. Assuming, however, that these are accurate statistics, the Viet Cong have two means of replacing these man-power losses: importation of cadres from North Viet-Nam or local recruitment within South Viet-Nam, or both. In any case, large numbers of men are involved. Concerning infiltration, only 914 persons are known to have been introduced into the RVN during 1963. Even if this represents only a small fraction of those actually arriving, clearly the bulk of the reported Viet Cong casualties must be replaced through extensive local recruitment. A recruitment program of this magnitude would appear to indicate a lack of meaningful progress in government efforts to attain control and influence -over the rural areas to deny the Viet Cong their main source of strength—the rural populace. Most significant perhaps, while the Viet Cong reportedly suffered over 27,000 casualties, they initiated and maintained a level of incidents and armed attacks in November which reached an all-time high.

The Viet Cong main force units have expanded over the past year. In 1962 there was insufficient evidence to confirm the existence of any regimental-type headquarters in South Viet-Nam. During 1963, five such headquarters have been accepted in the COMUSMACV order of battle. During 1962 a total of 30 Viet Cong battalions were confirmed. This number has increased to 37 confirmed battalions in 1963. In [Page 709] addition, the latest Viet Cong battalion has an accepted unit strength of 400 men, whereas during 1962 MACV computed these units at an average strength of only 250 men.

There have [has] been some variation in Communist tactics during recent months. For example, there is a growing tendency to stand and fight, to attack the same objective two and three nights running, and to employ large units when attacking objectives. In recent weeks there has been a slight but noticeable rise in the number of Viet Cong daylight attacks indicating perhaps a growing confidence in their ability to meet and defeat government forces in open combat. RVN use of armor and aircraft, however, will tend to inhibit enemy daylight activity. Also, in the past two months, there has been an increased Viet Cong underwater mining effort.

The Viet Cong have improved their antiaircraft capability through the capture of US automatic weapons and intensified AA training in the use of small arms against low flying aircraft and helicopters. This is evidenced by the growing number of RVN/US aircraft hit and downed. For example, during October and November 1963, over 100 aircraft suffered battle damage as a direct result of enemy ground fire.

Other factors favoring the Viet Cong are:

(1)
Defections: The Viet Cong appear to be defecting to the government in fewer numbers.
(2)
Intelligence: A well coordinated and highly effective Viet Cong intelligence and counterintelligence system is believed to exist. In many instances where RVN intelligence indicated the probable presence of the enemy and a friendly military operation was subsequently initiated, the Viet Cong either successfully escaped or tactically dispersed their forces and ambushed the attacking RVN unit. There is recent evidence of penetration of RVN paramilitary forces by the Viet Cong over the past year, facilitating attacks on the Civilian Irregular Defense Groups (CIDG) and the Vietnamese Special Forces.
(3)
Economy of Force: The preponderance of Viet Cong operations has been carried on south of Saigon where only roughly one-third of their main force units are located. The remainder of their main force units remain positioned through central and northern Viet-Nam where Viet Cong activity is relatively light.
(4)
Communications: We believe that the Viet Cong possess a highly sophisticated, effective and secure political and military communications network.
(5)
Food: Food is a problem for the Viet Cong but not a major one. The Communists have been able to by-pass controls established to deny them sustenance, although they have experienced more difficulty in the northern and central regions than in the delta where food is more plentiful.

In summary, the Communist capability to extend or escalate the insurgency has not been significantly negated. Available evidence indicates that while the Viet Cong have not made spectacular gains, they [Page 710] have prevented the RVNAF from gaining effective control over much of the countryside. Communist safe havens, bases, and transient areas are available to them in North Viet-Nam, Laos, and Cambodia.

It is apparent that the Viet Cong are maximizing their present capabilities, aided substantially by resources captured from government forces. It is evident that the Viet Cong over the past year have sustained and in many instances have improved their combat capabilities despite RVNAF advantages in firepower, armor, mobility, communications and airborne operations.

The Viet Cong have demonstrated an extensive capability to exploit the opportunities of the provisional government’s preoccupation with political reorganization during this transitional period. Unless the government attains organizational stability and is able to devote its major energies to the prosecution of the war in the near future, Viet Cong activities can be expected to increase.

  1. Source: Washington National Records Center, RG 330, OSD Files: FRC 69-A-3131, Vietnam 381. Secret; No Foreign Dissem.