18th Engineer Brigade Sep 1965 – Sep 1971

I and II CTZ and support of I FFV
HQ located at Tan Son Nhut until 1 Dec 1966
when it relocated to Dong Ba Thin.

35th Engineer Group Jun 1965 – Nov 1971.
HQ located at Phan Rang until Apr 1966,
when it moved to Cam Ranh Bay; it was at
Qui Nhon Jul—Dec 1968 and then returned
to Cam Ranh Bay.

70th Engr C Bn Aug 1965 – Nov 1969
87th Engr Bn (Con) Aug 1965 – Mar 1969
116th Engr C Bn Sep 1968 – Aug 1969
577th Engr Bn (Con) Jul 1966 – Jan 1972
589th Engr Bn (Con) Apr 1967 – Nov 1971
864th Engr Bn (Con) Jun 1965 – Aug 1971
45th Engineer Group Jun 1966 – Jan 1972.
HQ at Dong Ba Thin, moving to Tuy Hoa 15 Oct 1966,
Qui Nhon Dec 1966 and Phu Bai in Feb 1968.

14th Engr C Bn Oct 1966 – Aug 1971
39th Engr C Bn Jan 1966 – Apr 1972
84th Engr Bn (Con) Jun 1965 – Jul 1972

937th Engineer Group Aug 1965 – Sep 1971.
HQ at Qui Nhon, moving to Pleiku Nov 1966 and
Phu Tai 10 Mar 1970. This was the only engineer
group with “(Combat)” in its title; the others
were all “(Construction)” although all had a mix
of combat and construction battalions assigned.

19th Engr C Bn Sep 1965 – Dec 1970
20th Engr C Bn Jan 1966 – Aug 1971
299th Engr C Bn Oct 1965 – Nov 1971
815th Engr Bn (Con) Apr 1967 – Jan 1972
20th Engineer Brigade Aug 1967 – Sep 1971

III and IV CTZ and support of II FFV
HQ located at Bien Hoa.

34th Engineer Group Mar 1967 – Mar 1972.
HQ at Vung Tau, moving to Bin Thuy Feb 1969.

27th Engr C Bn Oct 19666 – Jan 1972
35th Engr C Bn Nov 1966 – Sep 1970
36th Engr Bn (Con) Sep 1967 – Apr 1972
69th Engr Bn (Con) May 1967 – Nov 1971
93rd Engr Bn (Con) Jun 1967 – Jul 1971

79th Engineer Group Jul 1966 – Dec 1970.
HQ initially at Phan Rang, moving to
Long Binh Oct 1966.

86th Engr C Bn Oct 1966 – Aug 1969
168th Engr C Bn Nov 1965 – Apr 1970
554th Engr Bn (Con) Apr 1967 – Mar 1972
588th Engr C Bn Nov 1965 – Nov 1970

159th Engineer Group Oct 1865 – Apr 1972.
HQ at Bien Hoa, moving to Long Binh Jul 1966.

34th Engr Bn (Con) May 1967 – Oct 1971
46th Engr Bn (Con) Sep 1965 – Nov 1971
62nd Engr Bn (Con) Aug 1965 – Nov 1971
92nd Engr Bn (Con) May 1967 – May 1972
169th Engr Bn (Con) May 1966 – Apr 1972

HQ 921st Engineer Group was in Vietnam 1 Oct 1966
to 25 May 1968, but never operated as a command
organization; it served to help staff U.S. Army
Engineer Command (Provisional) and then served
as a sort of holding unit until closed.