WHITE HOUSE REQUEST FOR AN ASSESSMENT OF NORTH VIETNAMESE STRATEGY OVER THE NEXT SIX MONTHS

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LOC-HAK-559-17-3-0
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RIPLIM
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S
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22
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January 11, 2017
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November 18, 2011
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3
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Publication Date: 
March 29, 1972
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MEMO
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OSD, ARMY review completed 29 March 1972 MEMORANDUM FOR: The Members, NSC Indochina Ad Hoc Group SUBJECT : White House Request for an Assessment of North Vietnamese Strategy over the Next Six Months Attached for your consideration are first drafts of the two papers requested by the White House: CENTRAL INTELLIGENCE AGENCY WASHINGTON, D. C. 20505, (a) Assessment of Probable North Vietnamese Military Strategy over the Net Six Months (b) Assessment of Probable North Vietnamese Political Strategy over the Next Six Months The drafts are rough because of the speed with which they were put together. They are offered as points of departure for your comments, criticism, and additions. '~- 0 %r ~~ -z- George A. Carver, Jr. Special Assistant for Vietnamese Affairs Copy No. No Objection to Declassification in Part 2011/11/22 : LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 DR No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 ? I I b7/0 ASSESSMENT OF PROBABLE NORTH VIETNAMESE MILITARY STRATEGY OVER THE NEXT SIX MONTHS Overview 1. The focus of this effort is likely to be in the rugged western parts of Military Regions (MR s) 1 and 2 in South Vietnam, where large numbers of well-equipped Communist troops are already arrayed. In southern South Vietnam, an expansion of terrorism and guerrilla activity is possible, but extensive Communist main force action seems unlikely unless the Saigon government moves enough of its troops north to MRs 1 and 2 to present Hanoi with an exploitable opportunity. 2. The Communists are also likely to continue the current offensive in northern Laos through the end of the dry season unless they secure the Long Tieng area before then. Southern Laos, by contrast, will probably see only limited activity designed to protect Hanoi's logistic network from any possible ground threat. Extensive main force activity in Cambodia looks unlikely given the extent to which Communist forces have been re- targetted against South Vietnam. In Laos and particularly in Cambodia, however, the Communists are almost certain to mount terrorist activities No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 especially when they want to unsettle the local government or feel them- selves in need of headlines. Timing 4. For maximum impact, it is likely that the Communists would in fact like to attack more or less simultaneously in MR 1 and MR 2. In MR 2 they still have time before the rains begin in May to mount a major attack against Kontum or Pleiku cities; at the least they would hope to give ARVN a highly visible bloodying. After the rainy season gets under way, they might return the 320th Division to North Vietnam, but it seems just as likely that they will keep their force structure in and near the highlands at something like its present level. No Objection to Declassification in Part 2011/11/22 : LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 5. Farther north, the Communists now have a new road on the east side of the mountains, and they will probably use it to keep on fighting in MR l through the summer. In both MR 1 and MR 2, they will be trying to bring unprecedentedly heavy firepower to bear on their adversaries. Elsewhere in South Vietnam, the goal of their main force units will be to tie down as many South Vietnamese troops as possible 25X1 and to test for weaknesses, probably in a fairly cautious way. A "Spontaneous Uprising ?" No Objection to Declassification in Part 2011/11/22 : LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 7. Broadly speaking, the Communists, probably have three interrelated objectives in this period: To undermine ARVN's self- confidence and its credibility with the populace, and thereby to reduce the effectivenes's of the pacification program; to influence U. S. domestic politics, particularly the election campaign; and to stimulate pressure in both South Vietnam and the U. S. for a negotiated settlement on something approaching the Communists' terms. Hanoi may also be harboring grander hopes-for a military victory so smashing as to undermine the Saigon regime, for instance, or for a significant surge of popular unrest. The Communists probably do not, however, consider such events particularly likely. They almost certainly have ruled out an all-or-nothing operation along the lines of the 1968 offensives, and they probably are prepared to live with the possibility that they will achieve no more than fairly modest gains in the next six months. Enemy Capabilities: Manpower and Disposition of Forces 8. This judgment of the enemy's objectives fits his capabilities quite well. Conscription in North Vietnam has been high over the past year, with large numbers of young men being inducted into the NVA to replace the troops sent to fight beyond the borders of North Vietnam. Thus far this dry season (i. e. , from 1 October 1971 to 25 March 1972), Hanoi has dispatched about 117,000 infiltrators to the southern war zones. This compares with some 106,200 during the entire dry season last year (1970- No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 1971). Sincc.thc infiltration flow in most dry se sons has almost ceased by the end of March, we may have seen the bulk of the infiltration this spring already. Infiltrators beginning the trek -from the north after March would generally arrive in the south at the end of the campaigning season, and rain comes to the Lao Panhandle in May--making travel more difficult. Furthermore, combat losses have not been heavy during the dry season campaigning to date, and thus the need for late-season infil- trators as replacements is not great. (This could change, of course, if large scale military action gets under way in coming weeks.) Infiltration starts, by destination, compare as follows: 1970/71 1971/7? (Oct 70-May 71) (Oct 71-25 Mar 72) GVN MRs I and 2 DMZ-Tri Thien-Hue 6,000 ! 12,000 MR 5 14,000 16,000 B-3 Front 14,500 40,000 GVNMRs 3and4 and Cambodia COSVN 45,000 35,000 South Laos 26,500 14,000 Total 106,200 117,000 As the infiltration figures indicate, the NVA threat to MRs I and Z has developed more strongly than to MRs 3 and 4. The estimate for the B-3 Front includes the 320th Division. The figure for the DMZ and the No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 r,i4- 13 C.. C / Estimated Strength of Communist Regular Combat Forces in Indochina (Thousand) December December December March 19159 1970 1971 - . 1972 VC/NIA 130-150 105-120 105-120 140-155. South Vietnam a/ 130-150 85-95 80-90 110-120 Cambodia 20-25 25-30 30-35 Khme Communist N.A. 10-20 15-30 15-30 PL/NVA 55-65 60-70 70-85 7085 Northern Laos 35-40 30-35 40-45 40-45 Southern Laos 20-25 30-35 30-40 30-40 a. Figures for South Vietnam include. those NVA forces located in southern North Vietnam between Dong Hoi and the D.'.1Z which are considered to be a threat to South Vietnam. These forces numbered 13,000 in December 1969, 10,000 in December 1970, 12,000 in December 1971 and 20 , 000 in March 19 72 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 expansion of the VC/NVA combat order of battle (OB) in South Vietnam and ? i Cambodia by about 27,000 men, increasing the combat OB from about 69,000 to 91,000 in South Vietnam and providing for a 5,000-man increase e- e- concentration of forces in Cambodia opposite GVN MR 3. The to COSVN's remaining 90,000 infiltrators have been used to expand the rear services system in South Laos and Cambodia and provide a stock of fillers to offset combat casualties. 11. It seems clear from the manpower situation that Hanoi has committed a large portion of its military assets this year to the various military fronts outside I,-'orth Vietnam. As a result of (a) this year's infiltration, (b) the recent unit deployments into South Vietnam.; and (c) an earlier expansion of the force structure in North Laos, there will remain in North Vietnam only 17 regular infantry regiments.* This is the smallest reserve force kept at home by Hanoi during any dry season since 1968 when the General Offensive was underway. In addition, there is some This assumes that the 308th Division, which at the moment is still in North Vietnam, is committed to redeploy to South Vietnam. No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 1'0. We estimate that this year's infiltration has provided for an No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 queation concerning the combat capability of some of these reserve regiments. As can be' seen from the following tabulation, GVN Main Forces still enjoy superiority in all Military Regions, but that superiority is significantly 12. This willingness of Hanoi to move an increasing proportion of its troops to areas outside North Vietnam has led to some change in the comparative enemy-versus -friendly combat strengths in South Vietnam. greater in MRs 3 and 4 than in MRs 1 and 2. Main Force Ratios (Allied/VC/NVA) MR 1 MR-2 MR 33 MR 4 SVN 1968 'Z. 4 3.3 3.9 2.4 2.9 1970 Z.7 7.0 4.5 8.3 4.3 1972 1.9. 2.4 19.5 7.4 3.7 (3.3) b/ (2.9) b/ a. The figures are a ratio of aggregate maneuver battalion strength. They include U. S. forces for 1968 and 1970 only, and in 1972 they include the GVN's Regional Force battalions. The ratios also reflect a maximum NVA buildup concept, including in 197, the 308th Division. The ARVN side of the ratio for MRs 1 and 2 also includes the planned deployment of the remaining Marines and Airborne out of the reserves. - b. The figures in parentheses result from the inclusion of COSVN's 5th, '7th, and 9th Divisions, which are targetted against South Vietnam but are presently in Cambodia near the GVN MR 3 border. 13. To the extent Hanoi's strategy considerations are based on its manpower commitments (and its judgments regarding allied strengths), MRs 1 and 2 continue to seem the most likely candidates for enemy-initiated ~uat_ No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 tiara, if the ? No Objection to Declassification in Part 2011/11/22: LOC-HAKI 559-17-3-0 NVA should launch such an offensive, fighting would e heavy and casualties high. Casualties would be particularly high for the N A, however, which is the offensive force and which is highly vulnerable- when its units are concentrated--to Allied firepower. Although local situations might develop that appeared desperate, the South Vietnamese forces in MRs 1 and 2 should be capable of protecting themselves and the populated areas of the region, and of retaking any key objectives lost in the opening round of NVA attacks. (This assessment is consistent with the views held by most senior South Vietnamese commanders.) 25X1 15. Hanoi's military strategy, in the southern Rs themselves is closely related to its strategy in Cambodia. The Nor h Vietnamese in Cambodia have attempted to create a situation in whi h Khmer Communist units along with certain NVA regiments which have be n converted into territorial-type light units, are strong enough on thei own to hamstring the Cambodian army. This would free the regular North ietnamese and Viet Cong main force units--which we designate as "mobil regulars"--to put pressure on CVN MR 3 and MR 4. Hanoi's objective is to tie down as many No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 . GVN forces in MRs 3 and 4 as possible. Hanoi will doubtless also seek to expand terrorist and sapper activity to the extent possible in both Cambodia and South Vietnam in furtherance of this ob ective. Given the ratio of opposing main forces, -however, it is unlike1 that the VC/NVA can bring off any striking successes in southern South Vietnam in the next six months. . 16. Hanoi also sharply increased its commit ent of forces to the war in North Laos this season. Heavy infiltration to and the end of 1971 included the deployment of three infantry regiments, mprovements in the air anal defense system, and increases in heavy artill ry'. By the end of 1971, the NVA enjoyed a combat force superiority of 4out 2. 5 to 1 over the Meo irregulars, F_~and Lao regular army (F R) personnel in the Plaine des Jarres area. 17. Hanoi's intention this season was to secure the Plaine des Jarres area by taking friendly strong points to the so Tieng, and to.destroy the remaining effectiveness of was" pr obabl decision to try for a major breakthrough in North Lao point, it is not yet clear whether NVA forces have ste the job of taking Long Tieng and associated, areas. B th, including Long ang Pao's army. one factor in Hanoi's this year. At this m enough to complete cause it is now late in the dry season, Hanoi probably wi 1 be unable to pr cipitate a major political crisis in Vientiane, even if he NVA should b successful against Lon, No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 Enemy Logistics 18. The overall picture of the Communists' l gistical activity during the past several months matches that of their ilitary manpower commitment. Unusually heavy levels of resupply hav been detected in South Laos and along the Cambodian and South Vietna frontiers--particularly the borders of MR 1 and MR 2. In North Laos the en my's offensive, now several months along, continues to receive substantial logistics support. 19. Currently, supply stockpiles in North Vietnam are extensive. Petroleum stocks in southern North Vietnam may be s high as 40,000 tons (the enemy's entire dry season POL requirement in s uthern Laos in only on the order of 15,000 to 20,000 tons) and the current inv?ntory of trucks is the highest ever. 20. Logistics-related construction continues o complement the buildup in stocks in North Vietnam. Two new airfiel s are under construction in southern North Vietnam which when completed--pr bably this summer-- will bring to six the number of airfields south of the 2 th Parallel capable of handling jet aircraft. A major new north-south road system is also being constructed. Segments extend from the Vinh area southward some 150 miles to within 17 miles of the DMZ. New constructi n extending the rail- road south of Vinh to within a few miles of Mu Gia Pa s, and new pipeline construction to connect Hanoi with the pipeline systems in the North Viet- namese and Laotian Panhandles is also underway. No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 Supply Movements This Dry Season 21. The Communist's annual dry season "General Transportation Offensive" in southern Laos got into high gear in earl y January and has continued unabated to the present. * Facilitated by a considerable road construction effort and restructured logistic apparatus, large quantities of supplies have been moved from North Vietnam thr ugh the Laotian Panhandle into Cambodia and South Vietnam. A new oad system has been built through the central Laos Panhandle; more han 100 miles of new roads are being constructed in northeastern C mbodia; four new roads are under construction through the DMZ into S uth Vietnam; and a series of new roads is being built south of the * The area has now entered the transitional weathe the rainy southwest monsoon season which starts usuz Thus far, however, weather has not yet affected the r remains in generally excellent condition. r phase preceding .lly in May., oad system which No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 tri-border area, presumably to support /troop deployments in the Central Highlands of South Vietnam. Zi.The level of logistic activity noted i the southern- most. part of the Laos Panhandle has been p rticularly impressive this dry season. For example, s the General Transportation offensive began in January, in the Ban Bac area reportedly delivered s tons. (an average of 113 short tons daily) ing the month -- probably the largest month detected moving that far south.* Besides southward deliveries, large quantities of have been detected moving eastward toward .Binh Tram 42 reported the delivery of 102 GVN MR 1 on seven days in late January. S Tram 37 revealed an average supply flow of daily to the B-3 Front in early February, same time maintaining a significant flow o to Binh Trams in northeastern Cambodia. A of 'supplies -- chiefly rice -- has also be in the tri-border area. The rice is deliv * Previous record levels of supply delive southern Panhandle were reached during Feb of 1970 when Binh Tram 35 reported receivi of 107 tons of supplies daily. Comparing STPD figure for January 1972 represents Bi deliveries farther south (not receipts fro well before the normal peak levels of acti March. Binh Tram 35 me 3,500 short f supplies dur- ly total ever. ese heavy ons daily to mi-larly, Binh some 64 tons hile at the supplies south northward flow n maintained red through ies in the uary and March an average he two, the 113 h Tram 35's the North) ity in February- No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 the northern Cambodia logistical network t Binh Tram 37 which distributes it among units in the so thern part of the Panhandle and also moves it to the eas along supply routes to South Vietnam. 23. Massive quantities -of arms and ammunit included in the detected supply deliveries. Binh Tram'45 shipped some 2,800 tons of or Tram, 46 along the new central road system The shipments included virtually every cat on have been For example, ance to Binh uring February. gory of weapon tnamese inven- and ammunition known to be in the North Vi tory and represent the largest monthly shi tions ever noted in COMINT in southern Laos level of activity along the central corrid into March. A summary report for the perio ment of muni- This high r has continued d 1-12 March -indicated that 1,650 tons of supplies, --- arms and ammunition -- were moved between B and 46. 24. This heavy supply activity in the south has '-had a dual imppt. First, activity on oughly half inh Trams 45 ern Panhandle the exit to South Viet- corridors has resulted in supply throughput nam and Cambodia this season being conside than that of last year at this time. Secon ably higher dly, this per- ent thei r formance has allowed the Communists to aug stockpiles of supplies, particularly of ar 25X1 25X1 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 w 14 - Whale throughput has been at high levels, one anomoly exists in the intelligence available for evaluating the dry season effort. The level of supply input into southern Laos as detected by sensors is running well below that re- corded last year. Several factors could explain this: Resupply requirements may be considerably smaller this year than last when the enemy was building very large supply stockpiles in anticipation of and defense against the ARVN operations. -- Required inputs from North Vietnam may be lower this year because of concentrated efforts by the Communists to achieve greater self-sufficiency in rice in south Laos and northern South Vietnam. Supplementing this.is a probably increased flow of rice from Cambodia to southern Laos and South Vietnam' a flow which should conceptually be considered "input". The extensive, expansion of the South -Laos/ Cambodia logistic system probably required levels of supply input which are currently unnecessary. With that system now. operat- ing more efficiently it presumably requires less input from the north for its own consumption. The Communists may be moving large No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 Northeast Cambodia 2-r.Resupply activity in northeast Cambodia this dry season has traced closely with that in South Laos. Traffic levels on the overland corridor.(Route 110/97) increased markedly in January and by mid-February had surged to moderate rates between the border and Stung Treng, South of Stung Treng, sizable volumes of ordnance supp~ies have continued to be shipped southward via the Mekong and Route 13 to Kratie, thence to enemy strongholds on either side of the Mekong. At the same time, the Com- munists have sustained a large flow of rice and gasoline north for consumption by enemy forces in the -Northeast, the southern part of the Laotian Panhandle, and in the B-3 Front area of South Vietnam. Concurrent' with the .large troop buildup in the.B-3 Front area, enemy engineers have constructed a series of new motorable roads and re- lated facilities in the area. The latest reports from aerial observers reveal that the roadnet will apparently WContinued from page 5 _ quantities of supplies stockpiled in the northern and central Panhandle last year forward toward South Vietnam and Cambodia this year. -- Finally, our sensor data on input may be incomplete. No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 - 16 link Base Areas 609 and 702 and also will provide a direct link to the Stung Treng military complex. North Laos ?_2The Communist dry season supply effort in northern Laos got into full swing well ahead of that in the Laos Panhand.Le. By September, extensive road work was underway and some resupply activity apparent, and by early Novem- ber very large quantities of supplies -- particularly arms and :ammunition -- were on their way to Communist forces who would launch the Communist dry season offensive in the Plaine des Jarres area. The results of this effort have been impressive: an evaluation of intercepted enemy communications suggests that the North Vietnamese have delivered 30% to 50% more supplies this dry season than ever before during a comparable period. Although the No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 ? 25X1 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 pace of supply activity has now sla%lod from its peak period of November through January, there is ample evi- dence that significant .'deliveries --- possibly including 40 to 50 'tons daily of ammunition -- have continued over the past two months. Zg While continuing a high level of supply deliveries, the Communists also have greatly upgraded their logis- tical and tactical capability in northern Laos by con- structing a major new supply route west of the Plaine. Now motorable to within a few-miles of the Long Tieng Valley, this road gives the Communists for the first time a motorable supply route by which to supply forces west of the Plaine. Through its use the Communist posture for pressing the assault on the Long Tieng'complex is greatly enhanced. Outlook for the Wet Season ?. Overall, the Communists' current logistic posture appears to be in its best shape of the past two years: their stockpiles -- especially of arms and ammunition --- appear sizable; their route structure has gained further redundancy and capability; and, they are capable of sup- porting a record level of rainy season activity, both across the DMZ and in the Laos/Cambodia border area. Finally, these developments will give them a stronger No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 logistics posture in the early stages Qf the 1972-73 dry season than they had this dry season. *3D,All signs indicate that the Communists will sustain a relatively high level of logistic activity over the next two months. By June,, however, the seasonal monsoons will affect the road network in south Laos and Cambodia and the level of activity will be sharply curtailed. Dur- ing the. summer, when rains are heaviest, the focus of activity throughout must of the Panhandle will be on local logistical activity. ?f Some resupply into South Vietnam and Cambodia will occur, however. Mid--March' photography has shown that the new Route 103/6086 structure through the DMZ can support vehicle traffic as far south as Khe Sanh. During the rainy season in Laos this route, as well as two others ex- tending into the DMZ are shielded by the mountains along the western DMZ boundary which effectively block.most of the rain. Thus, these roads give the Communists the ability'to move supplies directly into MR-1 from North Vietnam during the summer months if they so choose. In' the Laos/Cambodia border area the Communist rainy season effort is facilitated by their use of waterways. During last year's rainy season, the Communists relied heavily on these to deliver substantial quantities of arms and No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 ammunition south into Cambodia and. equally larg! quantities of rice in each of these areas, though not simultaneously in both Cambodia and MRs MRs 1 and Z, in Laos and in Cambodia. Assuming other factors provide/ no hindrance, they have the supplies to sustain extensive combat activities or eastward delivery to South Vietnam. 32. In sum, from the viewpoint of logistics, the Communists are now in a fairly favorable position in most parts of Indochina--in GVN (and some petroleum) north into the Laos Panhandle for consumption there I and 2 of South Vietnam. No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 97 - 33. In MR 3 and MR 4 of South Vietnam) the logistics situation of the Communists is less rosy. The loss of the Sihanoukville supply route is still being felt. The enemy's problems in MR 3 are substantial, but perhaps -it .1.1 C,lo Ai' , less th an a year ago. Despite ARVN pre-emptive operations in Cambodian areas adjacent to GVN MR 3, the Communists have had some success in sus- taining small but steady supply flows into Tay Ninh Province and points farther south. Several large caches, principally foodstuffs, were seized in northwest MR 3 early this year. '}-zizures provided limited evidence of enemy intentions to stockpile for future operations. No Objection to -Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0 34. The Communists face their most difficult problems in terms of supplies. in MR 4. The recent surge in enemy sea infiltration attempts (14 this dry season, seven since .January) attests to Communist resupply difficulties. Enemy forces in the Delta do have an overland supply link to Cambodia, but deliveries over this route must be considerably less than desired given the magnitude of the sea infiltration effort. Judging by the Communists' logistics problems, we do not foresee any significant threat from enemy main forces in this area over the next six months, although attention- getting terrorist and sapper activities are always possible. No Objection to Declassification in Part 2011/11/22: LOC-HAK-559-17-3-0