9th Signal Battalion (Divisional)

Arrived Vietnam: 19 December 1966
Departed Vietnam: 19 August 1969
Previous Station: Fort Riley
Authorized Strength: 
1968 - 641

The 9th Signal Battalion had the mission of providing signal communications to include establishment and operation of a division area communications system of signal centers, wire and radio trunk and local lines, and radio/wire integration stations providing general and direct communications support for units in the division area. The battalion was part of the 9th Infantry Division in Vietnam and was headquartered with the division. However, its elements were often scattered to provide direct support to the separated divisional units. 

13th Signal Battalion (Divisional)

Arrived Vietnam: 18 August 1965
Departed Vietnam: 29 April 1971
Previous Station: Fort Benning
Authorized Strength: Battalion
1966 - 352 / 1968 - 352 / 1970 - 256

The 13th Signal Battalion was part of the 1st Cavalry Division (Airmobile) in Vietnam and organized more lightly than a normal infantry division signal battalion. It was capable of planning and supervising communications, training and other maintenance of radio communications for the division elements as well as long-lines communications service to the division's far-flung elements. The battalion was responsible for the division area communications system.

36th Signal Battalion (Combat Area)

Arrived Vietnam: 28 November 1966
Departed Vietnam: 26 August 1971
Previous Station: Fort Bragg
Authorized Strength: Battalion
1966 - 845 / 1968 - 675 / 1970 - 754

The 36th Signal Battalion was responsible for installing, operating and maintaining a base camp communications system and was also charged with communications in the III Corps Tactical Zone. Initially part of the 1st Signal Brigade, it was quickly transferred to the 2nd Signal Group, and stationed at Long Binh until its departure from Vietnam.

37th Signal Battalion (Modified Support)

Arrived Vietnam: 20 October 1966*
Departed Vietnam: 28 June 1972
Previous Station: Vietnam
Authorized Strength: Battalion
1966 - 523 / 1968 - 559 / 1970 - 77**

* Conflicting sources, 8 October 1966 by authority of 1st Signal Brigade; 1 August 1966 by unit card; above date from US AS-TRATCOM GO 53, 29 July 1966. However, its organic companies were not raised until 14-16 November 1966.
** HQ and HQ Detachment only.

The 37th Signal Battalion provided an assigned segment of the area communications system in the I Corps Tactical Zone. In addition, it provided access to the system and signal  center services-telephone, teletypewriter, data and facsimile-when appropriate for units in that area. It provided, on a 24-hour basis, numerous signal  centers and related multi-channel communications systems and terminal facilities. Located at Da Nang, the battalion was under the 21st Signal Group until March 1969 when it was placed under the command of the I Corps Tactical Zone Signal Group (Provisional), later replaced by the 12th Signal Group. After that group left Vietnam in February 1972, the battalion was placed under the U.S. Army Contact Management Agency, Vietnam (Provisional).

39th Signal Battalion (Support)

Arrived Vietnam: 23 March 1962
Departed Vietnam: 14 March 1973
Previous Station: Fort Gordon
Authorized Strength: HHD
1964 - 1,283* / 1966 - 244 / 1968 - 117 / 1970 - 244 / 1972 - 109

*Reinforced battalion
The 39th Signal Battalion was originally responsible for all communications support in Vietnam  under the command of the U.S. Army Support Group, Vietnam. In 1965 it was reduced to the normal capabilities of a support signal battalion (see 37th Signal Battalion). Under the 2nd Signal Group it was responsible for service in the III and IV Corps Tactical Zones located at Vung Tau. It was then placed in charge of III Corps Tactical Zone service under the direct supervision of 1st Signal Brigade in December 1971, moving to Long Binh.

40th Signal Battalion (Construction)

Arrived Vietnam: 15 September 1966*
Departed Vietnam: 28 June 1972
Previous Station: Fort Bragg
Authorized Strength: Battalion
 1968 - 688 / 1970 - 652

* Main body of battalion arrived on 21 August 1966 but Company D (from Fort Polk) did not arrive until 15 September 1966.

The 40th Signal Battalion was specifically charged with the installation of fixed-plant communications cable in Vietnam. It also performed rehabilitation of existing indigenous lead-covered cable, field cable, open wire circuits and other field cable tasks. It served with the 1st Signal Brigade before being placed under the 2nd Signal Group on 22 August 1966 and then under the 160th Signal Group on 28 August 1967. The battalion was located at Long Binh, where it remained until it left Vietnam.

41st Signal Battalion (Combat Area)

Arrived Vietnam: 24 July 1965
Departed Vietnam: 27 February 1972
Previous Station: Fort Lewis
Authorized Strength: Battalion
1966 - 622 / 1968 - 703 / 1970 - 88*

*HQ and HQ Company only.

The 41st Signal Battalion was initially charged with communications in the I and II Corps Tactical Zones, later being limited to responsibility for the II Corps coastal area, specifically providing communications center, switchboard, radio and multi-channel communications facilities in the greater Qui Nhon vicinity. Based at Qui Nhon under the 2nd Signal Group, the battalion was next transferred to the 21st Signal Group in 1966 and finally came under direct 1st Signal Brigade command in December 1971.

43rd Signal Battalion (Modified Support)

Arrived Vietnam: 16 October 1966 *
Departed Vietnam: 30 May 1971
Previous Station: Vietnam
Authorized Strength: Battalion
1966 - 844 / 1968 - 874 / 1970 - 27 **

* Conflicting sources. Date used is by authority of USASTRAT-COM GO 53, 29 July 1966; 1st Signal Brigade date is 10 October 1966; unit card date is given as 1 August 1966.
** HQ and HQ Detachment only.

The 43rd Signal Battalion was responsible for communications support in the II Corps Tactical Zone Highlands (for capabilities, see 37th Signal Battalion) and was located at Pleiku. The battalion served under the 21st Signal Group for the duration of its Vietnam service.