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ARMY LCM's MINED AT TUYEN NHON
On 1 April 1970, two U.S. Army LCM's were mined at the
advaced Tactical Support Base (ATSB) Tuyen Nhon. The had apparently been placed by sappers between the LCM's and appoximately
fifteen feet forwad of the sterns. PBR's immediately attempted to assist the LCM's to dewater, but the damage was too
extensive. Both boats sank at their moorings. Divers investigating found that one boat had a 7 foot by 2 foot hole in the
side and bottom, and the other boat had a 3 foot by 2 foot hole in the side and bottom. EOD personnel estimated that 50 pound
charge of C-4 would be required to produce such extensive damage.
( What I remember as an eye witness to this attack, as
I was standing on an ASPB morred to the starbord side of one of the LCM's. That the boats were loaded with full loads of ammo
for the boat and base. There was an explosion and the two LCM's lurched into the air at the sternsand sank, swoosh. I donn't
remember any casualties, but it scared the bageebee out of this river rat. End of story.
BM3 R.L. McDevitt (Mack)).
OPERATION DEEP CHANNEL ll
In addition to other duties, CTG 194.9 assumed the
opcon, on 5 January 1970, of all elements assigned to Operation Deep Channel II, one of the largest combat demolition jobs
in the history of the Navy. The purpose of this operation is to connect the Kinh Gay and Kinh Lagrange Expansion, using
military explosives. This will in turn provide a patrolling route for river patrol craft in a formerly inaccessible area and
established a cordon to enemy infiltration from the tip of the "Parrot's Beak" southwest along the Kinh Bo Bo - a known enemy
infiltration route. The new six mile channel when completed will have the added benefit of providing the civilian population
in the area with a shot cut between Tuyen Nhon and Tra Cu, thus making it easier for them to transport products to the Markets
in Saigon, Tay Ninh City, and elsewhere. By the end of January, Detachment Delta of Underwater Demolition Team Twelve
(UDT-12) and a detachment Vietnamese Navy Frogmen, all under LTJG Walter R. Harvey, were well on their way to completion of
the channel blasting. In addition, other units were involved as seen on the following Task Orgaization Chart.
Chart Break Down
A) TG-194.9 , GIANT SLINGSHOT , COMMANDER GIANT SLINGSHOT
,Provide overal coordination.
B) TG-115.9 , COASTAL
SURVEILANCE GROUP , COMMANDER, TG-115.1. Provide UDT personnel.
C) TG-115.7 , SOLID ANCHOR , COMMANDER, TG-115.7
Provide UDT personnel.
D) TU 194.9.1 TRA CU INTERDICTION UNIY, COMRIVDIV
552 , Provide support as requested by CTE 194.9.3 .
E) TU 194.9.5 , TUYEN NHON INTERDICTION
UNIT, COMRAD 153 , Coordinate employment of USA infantry platoons. ( also provided Alpha boats in support and transport).
F) TE 76.0.6.2 , UDT TWELVE, COMMANDER, UDT TWELVE, Provide
one officer / ten enlisted to CTE 194.9.9.3 .
G) TE 194.9.93 , Kinh Gay SPECOPSGRU , OINC, KINH GAY
SPECOPSGRU , Assume opcon UDT perssonel. Direct extending and clearing operations. Coordinate between USA and USN.
H) TE 194.9.5.3 USA INF PLT AS ASSIGNED , CO, USA INF
PLT AS ASSIGNED , Provide direct suport to CTU 194.9.5 .
I) NAVAL SUPORT ACTIVITY, SAIGON , COMNAVSUPPACT
SGN , Provide logistics support.
CLICK PICTURE TO ENLARGE
| UDT CARRYING EXPLOSIVES |

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| UDT FLOTING EXPLOSIVES. |

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