AIRFIELD UNDER CONSTRUCTION YEN BAI AREA, NORTH VIETNAM

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP02T06408R001200010033-1
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 18
• Document Creation Date: December 28, 2016
• Document Release Date: May 11, 2012
• Sequence Number: 33
• Publication Date: July 1, 1966
• Content Type: REPORT

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AIRFIELD UNDER CONSTRUCTION
YEN BAI AREA, NORTH VIETNAM
t JII']lIMI
DATE JULY 1%G
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This document contains information affecting
the national defense of the United States,
within the meaning of Title 18, sections
793 and 794, of the U.S. Code, as amended.
Its transmission or revelation of its contents
to or receipt by an unauthorized person is
prohibited by law.
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 RECORD COPY NO. PUB. DATE LVLAI IVN DATE RECEIVED L111-Al 11114
COPY MASTER
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PIR-77024 July 1966 C
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 CONFIDENTIAL
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AIRFIELD UNDER CONSTRUCTION
YEN MI AREA, NORTH VIETNAM
cIA/PIR-77024
CONFIDENTIAL
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CONFIDENTIAL
YEN PAl AIPFLD UNDER CONSTRUCTION
PREFACE
Analysis of aerial photography taken over Yen Bai, North Vietnam, has
led to the conclusion that an airfield is under construction (21 43 40N-
104 51 50E, UTM coordinates VK852030) 2.1 nm NNW of the town of Yen Bai,
North Vietnam. The entire area of interest - including the airfield,
support facilities, storage area, and truck parks, comprises a 5.3 square
nautical mile area.
The construction activity has progressed through two stages - the first
stage, which is coming to a close, involves improvement of existing roads
and the construction of new ones; the building of workers' housing and
storage facilities; the addition of AA and AW sites, which are continually
relocated as construction progresses; and the expansion of existing drainage
systems by the excavation of new canals along the periphery.
Workers' housing, storage facilities, and road construction projects
appear to have now been completed, indicating the beginning of the second
stage. From the end of March 1966, this second stage has shifted emphasis
to a major construction effort involving the grading, leveling, filling,
and clearing of the predominantly karst terrain. Photography has also
revealed piles of aggregate on the bank of the Red River adjacent to the
construction site. The drainage system that is evolving is quite elaborate,
primarily because the low lying terrain is subject to flooding.
The orientation of the airfield is favorable to the prevailing winds
in the area, and allows for further expansion in either direction. The
ensuing text will historically document the progress of this airfield in
detail, with photography of the area taken between
CONFIDENTIAL
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A. Gabe 8
CIA/PIR-77024
1. High altitude aerial photography, dated revealed
that within an area 2.1 nm northwest of Yen Bai, or Vietnam, construction
activity was in progress in the form of new road construction and improvement
of existing roads.
2. Four probable vehicle revetments, which appeared unoccupied, were
observed at VK842041.
3. Eighteen light anti-aircraft sites (number of positions varied from
two to eight) and 18 automatic weapon sites were identified within, or
surrounding the area of interest. Of the 18 AA sites, six were occupied,
four unoccupied, and eight were under construction. Occupancy of the AW
sites could not be determined.
4. There are 30 identifiable buildings, probably civilian, within the
immediate area. No heavy engineer equipment or vehicles were observed.
B. BLUE SPRINGS
1. High altitude aerial photography dated revealed
that there was a significant increase in construction activity since August
1965. A major effort had added 203 new buildings within the immediate area.
They have the appearance of barracks or storage-type buildings - rectangular
in shape and not at all consistent with the indigenous Vietnamese architecture.
2. Other developments consisted of new road construction and the continued
improvement of existing ones and 20 new air defense sites, five of which were
light AA and the remainder AW sites. The occupancy of these sites could not
be determined due to the quality of the photography.
1. Medium altitude aerial photography dated
continued significant changes since
?11 L..U nrimeuia-ce area.
revealed
2. Major earth-moving activity was observed in an attempt to level and
fill the existing terrain, which is predominately karst, from VK84.5037 to
VK862020. There were approximately 39 pieces of heavy equipment present;
however, due to photo quality the specific class of equipment could not be
identified. The following pieces of equipment were observed: 11 possible
bulldozers, eight possible tractors, 11 possible cargo/dump trucks, four
possible earth scrapers, one possible crane-shovel and four possible rollers.
3. Other new activity consisted of sixteen new AW sites and 51i. new
storage-type buildings. As of there were 287 buildings
5. New road construction and improvement continued since
(Note overlay.)
4. A drainage pattern was evident with two large canals having been
excavated. One canal begins at VK861019 and continues on to VK871009, at
which point it flows into a small stream. The other canal parallels the
construction activity from VK857029 to VK848039. (Note overlay.)
1. Medium altitude oblique aerial photography dated
revealed significant changes in the area since These
changes centered around an attempt to level an i the existing karst
terrain. A definite pattern has taken shape from this attempt; the
pattern was 7200' long and 800' wide.
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 CONFIDENTIAL
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2. An extensive drainage pattern had emerged with the most recent
addition being a canal running parallel to the earth moving activity from
VK846034 to VK861oi8.
3. Individual revetments and revetted truck parks had been built along
with temporary drive-through revetments on the construction site itself. An
open storage area (apparently POL drum storage) is adjacent to the activity
at VK857029. Quality of the photography precluded a determination of the
number of drums stored there.
4. There were 14 new air-defense positions, but due to obliquity and
resolution it could not be determined whether they were occupied, or if
they were AA or AW sites.
5. A pontoon bridge was observed in place spanning the Red River at
vK861999.
6. With the work emphasis on earth moving, road construction slowed,
although some improvement was noted.
7. Approximately 36 pieces of construction equipment were observed
within the area, of which the following 22 could be identified: three bull-
dozers, four cargo/dump trucks, two probable trucks, five possible rollers,
five tractors, one probable tractor, five earth scrapers, and one probable
earth scraper.
1. Medium altitude panoramic aerial photography dated
indicated that the construction activity was now centered almost exclusively
on leveling and filling the terrain in one particular area. Photographic
coverage from August through December indicated that the primary effort was
to develop good logistical support by developing an adequate road system as
well as adequate storage and support facilities. The April coverage indicates
a phasing out of this as a prime activity with few new road extensions or
new buildings observed since December. This new phase, centered around the
leveling of the terrain, extends from VK845031 to VK863020. Remarkable
progress was evident in an attempt to level this area, along with a noted
enlargement and extension of the already developing drainage system. The
photography revealed at VK842041 a large work force of "coolie labor" being
employed to excavate a drainage canal. Also noted was a pile of aggregate,
probably being used to help fill and compact the soil, on the bank of the
Red River at VK837036.
2. A new drainage canal was under final stages of completion extending
from vx861026 to VK867023. This canal will probably continue to extend
southeast until it joins a stream at VK872017. (Note map overlay.)
3. Twelve new light AA sites had been built since
of which appeared to be occupied.
-ione
4. Of approximately 33 pieces of equipment observed, the following 30
could be identified: seven probable earth scrapers, two possible motorized
crane-shovels, three probable dump trucks, ten probable bulldozers, and four
possible rollers. At vJ866999, two junks were observed, one with a probable
cargo of wood. Parked alongside the junks were two possible trucks.
1. Medium altitude aerial photography dated) /indicated that
new earth-moving activity had enlarged the previous area under construction.
This new area was 10,500' long and 1,000' wide (VK8)-i-3042, vK866019, vK861017,
and VK840039). New activity paralleling the airfield site had developed a
pattern that extended from one end of the airfield to the other, VK840O39 to
9x862017. (Note map overlay.)
CIA/PIR-77024
2. Coverage of the area immediately northeast of the construction site
indicated that since (the date of last available coverage)
a major effort had produced a massive storage complex. This complex was
contained in an area of approximately three square nautical miles (VK8390)-i-6,
vK858o59, VK887035, VK871018). Photography indicated that this area was
being used primarily for worker's housing and the storage of construction
materials, and equipment. Several new truck parks and numerous vehicle
revetments indicated a determined effort to conceal and protect the equip-
ment. One such revetment, in final stages of construction, will provide
a permanent protective covering over an existing drive-through revetment
at VK859032.
3. Significant truck parks are evident at:
a. VK859045 - This truck park had seventeen parking revetments
containing six pieces of equipment, one of which was a tractor-
scraper combination. The remaining pieces of equipment were
unidentifiable. Adjacent to the truck park at VK857044, was
a new area being constructed for vehicle dispersal with a large
pile of wood stored in the open.
b. 1/1(860052 - This truck park had 12 identifiable vehicle revetments -
foliage prevents further analysis. No equipment was observed at
this time.
C. VK864036 to yK859032 - This large truck park followed a major
road running north and south and had 26 vehicle revetments, some
of which were the drive-through type. Foliage had at this time
concealed the major portion of a truck park at VK859031. A
tractor-scraper combination was identified in a drive-through
revetment, but other equipment proved more difficult to identify
due to foliage, canvas-coverings, or film resolution.
4. The following areas are groupings of storage and support-type build-
ings that make up this complex. These buildings, rectangular in shape, and
approximately 30 to 50 feet in length by 25 feet in width, have gable roofs
and do not conform to the local architecture - which consists of thatch-roofed
huts or dwellings. This breakdown is an attempt to discriminate between the
existing indigenous dwellings and the new storage complex: (Note photo mosaic)
Area 1 - 1/1(859055, VK861053, V1(859053, VK857054; five storage/support
buildings served by newly improved road. It appears that an
attempt had been made to conceal these buildings from the air
by use of existing foliage. To the north at 1/1(862055 were
two vehicle revetments and three pieces of equipment. This
location is 1.3 nm NE of the actual construction activity
and typifies the effort which had been made to disperse val-
uable construction equipment at the end of the day.
Area 2 - VK857052, 1/1(859051, VK857046, VK849050, 1/1(850051, 1/1(852052;
area comprises 62 storage/support buildings served by a new-
ly constructed improved road. A network ,of personnel trench-
es was evident, as were AW sites and one light AA site.
Area 3 - 1/1(865050, 1/1(861049, 11(859051; area included 23 storage
support buildings served by newly improved road. A small
storage area with three vehicle revetments was observed at
1/1(859050. A light AA site was located next to this storage
area.
Area 4 - 11(869050, 1TK864045, 1/1(864050; area included 28 storage
support buildings served by newly improved and constructed
roads.
CONFIDENTIAL
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 CONFIDENTIAL
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Area 5 - VK871045, VK873044, VK872043, VK869044; area comprised of
ten storage/support buildings adjacent to native village.
The village is associated with agricultural activities and
had not changed since first observed on
Area 6 - VK867044, VK866042, VK864043; area comprised of 15 storage
support buildings which are adjacent to newly improved roads.
Lack of adequate roads indicates that no vehicles or equip-
ment were being brought into this area at this time.
Area 7 - VK863045, VK865044, VK863042, VK861043; area included 20
storage/support buildings that are interconnected by numerous
personnel trenches. Area served by newly improved roads
and defended by an AW site.
Area 8 - VK863043, VK869037, VK871034, VK870032, VK861040; area
comprised of 62 storage/support buildings interconnected
by an extensive network of personnel trenches and defended
by AW positions; it is served by newly improved roads capable
of handling heavy equipment. This same area in August 1965
lacked buildings and the only activity was limited to small
agricultural endeavors.
Area 9 - V1K858042, VK858038, VK856038, VK856042; area included 27
storage/support buildings interconnected by personnel trench-
es; a truck park at VK858039 with nine vehicle revetments,
two of which were covered with roofs; and an open storage
area at VK858037 with piles of wood stacked uncovered.
Area 10 - VK861035, VK862034, VK861033, VK860034; area comprises
15 storage/support buildings, some of which look like
native huts. This area had two native huts in August
1965, but because of the area's location in relation
to the new road network it appears to be used for support
purposes. Personnel trenches have been added and vehicle
revetments are numerous.
Area 11 - VK853040, VK859033, VK858032, VK852039; area contained 42
storage/support buildings that at this time were not served
by any newly improved road. It is a heavily defended area
surrounded by light AA and AW sites.
Area 12 - VK874041, VK875039, VK871037, VK869038; area had 25 storage
support buildings compared to six native dwellings in August
1965. Personnel trenches were evident; an attempt has been
made to conceal some newer storage buildings under the
canopy of the trees. Newly improved roads connect from
four directions to serve this area.
Area 13 - VK880043, VK884039, VK880032, VK877037; this large storage/
support area encompassed 26 buildings, all of which were
served by newly improved and constructed roads. A very
extensive trench system was evident under the foliage,
with attempts to conceal some buildings. This area was
virtually uninhabited in August 1965.
Area 14 - VK874037, VK875035, VK873033, VK872035; area included 33
storage/support buildings in an area that in August 1965
was uninhabited; a newly constructed road network connects
this area with previously improved roads; a small truck
park at vK872036 had four vehicle revetments and a pull-off.
Area 15 - VK872033, VK879023, VK877023, VK872031; area composed of 31
storage/support buildings served by a newly improved road.
This area was uninhabited in August 1965.
CIA/PIR-77024
Area 16 - VK868032, VK872024, VK869023, VK866032; area included 11
storage/support buildings that were predominately indigenous
in appearance. Eight of these buildings were observed in
August 1965; however, the location of the dwellings indicate
their probable use in support of the construction effort.
Area 17 - VK864033, VK865027, VK86402i-, VK862032; area had 44 storage/
support buildings that were served by a newly improved road
and heavily defended by light AA and AW sites. This area
was not built-up in August 1965.
Area 18 - vK868022, VK870019, VK869016, VK866019; area consisted of
20 storage/support buildings, interconnecting trenches,
and AW sites. Area was not built up in August 1965.
Immediately surrounding the construction site were approximately
170 buildings that are probably supporting the construction effort, but
their exact function cannot be determined. This brings the total number
within the area of interest to 719 or a net increase since
____of 434 new buildings. These new buildings are primarily the storage
and support buildings located within the storage complex itself.
5. Approximately 111 pieces of equipment were noted; however, due to
the film resolution and canvas coverings, 62 pieces were unidentifiable.
The remaining 49 pieces of equipment could be identified as follows: three
trucks, two probable trucks, ten tractors, ten earth scrapers, 17 bulldozers,
five probable bulldozers, and two probable crane shovels. However, large
scale photography dated Oprovided sufficient resolution to
identify one earth scraper of the D-374 class. No further identification
was possible.
6. A large number of new interconnecting roads had been constructed
within the storage and support complex (note map overlay).
7. Aggregate has appeared at a ferry slip (vK859009) and across the
Red River at another slip (VK858005). Dredging for aggregate appears
evident 5.2 nm to the north, on the Red River at VK794095, and near the
construction site on the bank of the Red River (VK837036). Other piles
near the site are located at: VK848017, UK868010 and VK875040.
8. Five new light AA sites were identified; three of which were occupied.
Due to the good vertical coverage of the photography, a complete
analysis of the defense posture of this area was possible. There were a total
of 50 AA sites, 17 of which were occupied, and 56 AW sites.
Light AA
Number of
Gun Positions
Per Site
Number of Sites
Completely Occupied
Number of Sites
Unoccupied
2
3
3
3
1
4
8
14
5
1
6
8
7
8
20
30
9. Expansion of the drainage system was continuing as of
larger and deeper canals replacing temporary ditches.
CONFIDENTIAL
with
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 CONFIDENTIAL
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CONTRASTING ARCHITECTURE
CIA/PIR-77024
Photos A and B illustrate the
architecture of the storage and
support buildings that have been
newly constructed within the
immediate area. Note the long
rectangular shape, gable roof
and wood construction.
FIGURE NO. IL
Photo C illustrates the local architecture,
consistent with the style employed by the
indigenous Vietnamese, in contrast to the
storage buildings. The native dwellings
have hipped roofs with roofing material
predominantly of thatch.
CONFIDENTIAL
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 CONFIDENTIAL
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HARDENED STORAGE AREAS UIC
Photo A illustrates a drive-through
revetment at VK859032, that is being
hardened for use as a possible storage
area. This operation is nearing coin-
pletion, with the roofing nearly intact.
Photo B illustrates two examples at
VK 865022, that are in earlier stages
of construction. The cuts have been
made into the hillside and it appears
that the sides are being reinforced
before the roofing is attached.
FIGURE NO. 2
CIA/FIR-7702+
CONFIDENTIAL
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 CONFIDENTIAL
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EQUIPMENT DISPERSAL
VK8620?6
vehicle revetment
equipment
obable
earth scraper-D-374 class
probable tractor
(vehicle dispersal area
FIGUFN NO.
tractor-scraper
cIA/PIR-77024
tractor-scraper
canvas-covered equipment
LEGEND
AA SITE '%.
AW SITE4
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CONFIDENTIAL
CONSTRUCTION ACTIVITY AS OF
perr~~anen ratnage`
CIA/PIR-77024
xtensive personnel trenches
f
probable towed roller
temporary revetments
UII equipment
filled-in area
WI equipiTTent
LEGEND
AA SITE,
AW SITE''
IGURE O.
CONFIDENTIAL
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 (nNfn~NTiei
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OIA~PIR-7702+
VK8680
enlargement of drainage canal'
LEGEND
AA SITE k
AW SITE
Liraina
fL' native deI Ii rigs
drive-through revetments
new earth-moving since
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 Declassified in Part - Sanitized Copy Approved for Release 2012/05/11: CIA-RDP02T06408R001200010033-1
CIA/PIR-77024
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Declassified in Part - Sanitized Copy Approved for Release 2012/05/11 : CIA-RDP02T06408R001200010033-1
 25X1
rn/DTP_77024
Declassified in Part - Sanitized Copy Approved for Release 2012/05/11: CIA-RDP02TO6408R001200010033-1
Declassified in Part - Sanitized Copy Approved for Release 2012/05/11: CIA-RDP02TO6408R001200010033-1
 VK_
TRUCK PARK
Declassified in Part - Sanitized Copy Approved for Release 2012/05/11: CIA-RDP02T06408R001200010033-1
HANOI-LAO CAI RR
YEN BAI AIRFIELD U/C
214340N/1045150E
AILEGEN
AA SITE
Declassified in Part - Sanitized Copy Approved for Release 2012/05/11: CIA-RDP02T06408R001200010033-1
 CONFIDENTIAL
Declassified in Part - Sanitized Copy Approved for Release 2012/05/11: CIA-RDP02T06408R001200010033-1
BEFERENCES
MkPS
ANS. Series L701, 5976 II, Yen Bay Scale 1:50,000, 1st Edition,
1963 (UNCLASSIFIED)
ACIC. Joint Operations Graphic - Air Series 1501, Hanoi, Vietnam,
NF 48-10, Scale 1:250,000, 1st Edition, June 1965 UNCLASSIFIID)
REQUIREMENT
c-RR6-83,410
CIA'IAD PROJECT
30910-6
CIA/PIR-77024
CONFIDENTIAL
Declassified in Part - Sanitized Copy Approved for Release 2012/05/11: CIA-RDP02T06408R001200010033-1
 Declassified in Part - Sanitized Copy Approved for Release 2012/05/11: CIA-RDP02T06408R001200010033-1
I.UIVrIUtly I IML
CONFIDENTIAL
Declassified in Part - Sanitized Copy Approved for Release 2012/05/11: CIA-RDP02T06408R001200010033-1