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One ONTOS section was located at (BT059647) in support of the 1st Platoon
"D" 1/1 and the other section at (BT104655) in support of the 3d Platoon
"D" 1/1.    On 4 July one ONTOS was hit by VC small arms fire on the number
2 and 3 recoilless rifles.    Both rifles were taken to FLSG for a service-
ability check.     On 5 July the 1st Platoon "D" 1/1 displaced to (BT069639)
and the ONTOS displaced with it.   The same day the ONTOS section with the
3d Platoon "D" 1/1 displaced to (BT109642).    On 6 July the ONTOS section
with the 1st Platoon "D" 1/1, fired three major rounds (106MM recoilless
rifle HEP-T) and 800 rounds of Cal 30 machinegun ammunition at VC snipers,
with negative results.    On 9 July the ONTOS section with 1st Platoon, "D"
1/1 fired six major rounds at snipers located at (BT054650) with negative
results.   The same day the other ONTOS section located at (BT070650) fired
100 rounds of Cal 30 machinegun ammunition at VC snipers located at (BT070-
648) and (BT067649) with negative results.    On 13 July one ONTOS supporting
2nd Platoon "D" 1/1 and one ONTOS from the 1/1 CP were dispatched to (BT050-
645) where a "D" 1/1 patrol was under fire from VC snipers.    The ONTOS
fired 10 major rounds at hedgerows (BT048645) with negative results.    On
15 July the entire platoon moved to (BT081642) in support of "D" 1/1.   On
17 July one ONTOS returning from the 3d ATBn maintenance area to "D" 1/1
was being led by a M-422 Mighty Mite.     Th M-422 was ambushed by an un-
known number of VC at (BT069690).   The VC fired 30 rounds of small arms
at the Marines in the M-422.    The Marines returned fire with 25 rounds of
7.62MM and 45 Cal ammunition.   When the ONTOS arrived on the scene the VC
broke contact.   Negative results were reported.    On 17 July one ONTOS
section was assigned a direct support mission for "M" 3/1 (BT049692)
on a COUNTY FAIR mission.

                              (3)    HUE-PHU BAI TAOR

                                         (a)    Company "B" continued in direct support of the 4th
Marine Regiment.   The 1st Platoon commenced the month in direct support of
the 4th Marines, maintaining defensive positions from 1 to 11 July 66.    On
12 July Company "B" received a Frag Order from the Commanding Officer, 4th
Marines to depoy one ONTOS platoon and the Company Command Group to DONG
HA (YD244599), in support of Operation HASTINGS.   At this time the 1st
Platoon was assigned the mission of providing security in the 1/4 vital
area, relieving the 3d Plt, Company "B".   The platoon remained in defensive
positions for the remainder of the mont with the exception of one ONTOS
section which provided a convoy escort mission.   The ONTOS section departed
PHU BAI, escorting a convoy to DONG HA on 15 July and returned on 16 July.
The 2nd Platoon commenced the reporting period in direct support of the 4th
Marines.    On 8 July the Company received a Frag Order to send on platoon
to DONG HA Airstrip (YD244599).    The platoon departed PHU BAI at 100640H
July, providing convoy escort to DONG HA.   Upon arrival it was placed in
direct support of 2/1.    On 14 July when Company "B" (-) arrived at DONG
HA the platoon rejoined the Company for the deployment to CAM LO (YD132-
591) for Operation HASTINGS.    Upon arrival at CAM LO, the platoon was
placed in defensive positions guarding the Task Force Delta CP and heli-
copter LZ.   On 30 July the platoon was chopped from direct support of the
4th Marines and placed under OPCON of 3/4.

                                                                                                                                            ENCLOSURE (1)
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DECLASSIFIED


DECLASSIFIED



HEADQUARTERS
3d Antitank Battalion (Rein)
3d Marine Division, (Rein)  FMF
FPO San Francisco 96602
                                                                                                                                                      3
                                                                                                                                                      5750
                                                                                                                                                      Ser:  0117-66
                                                                                                                                                      10 Aug 1966


CONFIDENTIAL

From:          Commanding Officer
To:              Commanding General, 3d Marine Division  (Rein),  FMF  (Attn:  SC-3)

Subj:           Command Chronology, July 1966;  submission of

Ref:            (a)  NCO 5750.2
                      (b)  DivO 5750.1

Encl:           (1)  Command Chronology
                      (2)  Staff Journals
                      (3)  SITREPS

1.   In compliance with the reference, enclosure  (1) through
(3) are submitted.


                                                                                                    (Signature)
                                                                                                    E. R. LARSON













DECLASSIFIED
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PART I

1.   Reporting unit - 3d Antitank Battalion, 3d Marine Division, FMF

2.   Period covered - 1 - 31 July 1966

3.   Date of submission - 10 Aug 1966

4.   Commanding Officer - Lieutenant Colonel Bruce A. HEFLIN, USMC
                                                        (1 - 13 July 1966)
                                                        Major Eddis R. LARSON, USMC
                                                        (14 - 31 July 1966)

5.   Command Post - Republic of South Vietnam (AT987711)  Map AMS
                                            Series L 701, Sheet No. 6659 III.




















                                                                                                                                                      ENCLOSURE (1)
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PART II

1.          Operation Data, including attachments:

             a.            Designation/Location

                              (1)   Headquarter and Service Co.                              (DANANG TAOR)
                              (2)   Co "A"                                                                            (DANANG TAOR)
                              (3)   Co "B"                                                                            (PHU BAI TAOR)
                              (4)   Co "C"                                                                            (DANANG TAOR)
                              (5)   Co "A"  (-), 1st ATBn                                          (DANANG TAOR)

             b.            Period covered by report:   1-31 July 1966

             c.            Name/Rank of Commanding Officer and Staff, and principle sub-
ordinates, including T/O billet assignment.

BATTALION HEADQUARTERS

Commanding Officer..................................................................LtCol B A. HEFLIN
                                                                                                                                     (1-13 Jul 66)
                                                                                                                                     Maj E. R. LARSON
                                                                                                                                     (14-31 Jul 66)
Executive Officer.......................................................................Maj E. H. GRAHAM
                                                                                                                                     (1-4 Jul 66)
                                                                                                                                     Maj E. R. LARSON
                                                                                                                                     (5-13 Jul 66)
                                                                                                                                     Maj K. E. SHARFF
                                                                                                                                     (14-31 Jul 66)
S-1/Adj........................................................................................2ndLt G. DOHSE
                                                                                                                                     (1-10 Jul 66)
                                                                                                                                     WO S. R. JACKSON
                                                                                                                                     (11-31 Jul 66)
S-2...............................................................................................Maj E. R. LARSON
                                                                                                                                     (1-13 Jul 66)
                                                                                                                                     WO C. C. HARRIS
                                                                                                                                     (14-31 Jul 66)
S-3...............................................................................................Maj E. R. LARSON
                                                                                                                                     (1-13 Jul 66)
                                                                                                                                     WO C. C. HARRIS
                                                                                                                                     (14-31 Jul 66)
S-3A............................................................................................WO C. C. HARRIS
                                                                                                                                     (2-13 Jul 66)
                                                                                                                                     Unassigned
                                                                                                                                     (1 and 14-31 Jul 66)
Liaison Officer...........................................................................Unassigned
S-4..............................................................................................Maj K. E. SHARFF



                                                                                                                                                      ENCLOSURE (1)
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Supply Officer.............................................................................2ndLt R. U. BOKELMAN
Motor Transport Officer............................................................Capt. H. R. MARWITZ
Ordnance Maitenance Officer...................................................GySgt C. P. Mc DONALD
Communications Officer.............................................................2ndLt M. C. SCHROEDER
Medical Officer...........................................................................HMC G. K. LAW, USN

Headquarters and Service Co.

Commanding Officer..................................................................Capt. B. M. MATHEWS

Company "A"

Commanding Officer..................................................................Capt S. R. STEWART
                                                                                                                                     (1-10 Jul 66)
                                                                                                                                     Capt A. A. COMPTON
                                                                                                                                     (11-31 Jul 66)
Executive Officer.......................................................................1stLt S. T. FLYNN
                                                                                                                                     (1-2 Jul 66)
                                                                                                                                     Unassigned (3-31 Jul 66)
1st Plt Commander.....................................................................2ndLt E. A. ROBITAILLE
2nd Plt Commander....................................................................2ndLt R. W. BERNARD
3d Plt Commander......................................................................1stLt M. P. KINGSTON

Company "B"

Commanding Officer..................................................................Capt D. C. SATCHER
Executive Officer.......................................................................Unassigned
1st Plt Commander....................................................................2ndLt T. J. MEEHAN
2nd Plt Commander...................................................................SSgt A. MAMARIL
                                                                                                                                    (1-23 Jul 66)
                                                                                                                                    1stLt S. L. CAMBY
                                                                                                                                    (24-31 Jul 66)
3d Plt Commander.....................................................................2ndLt M. H. PONDER

Company "C"

Commanding Officer.................................................................Capt F. FIRING
                                                                                                                                    (1-2 Jul 66)
                                                                                                                                    1stLt S. T. FLYNN
                                                                                                                                    (3-31 Jul 66)
Executive Officer......................................................................Unassigned
1st Plt Commander....................................................................2ndLt H. J. RILEY
2nd Plt Commander...................................................................2ndLt  A. W. HOOF
3d Plt Commander.....................................................................1stLt D. K. CASWELL

Company "A"  (-), 1st ATBn  (OPCON 3d ATBn)

Commanding Officer.................................................................Capt G. R. VAN HORN
Executive Officer......................................................................1stLt G. J. FORBES



                                                                                                                                                      ENCLOSURE (1)
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1st Plt Commander....................................................................Sgt J. W. ANDROLOWICZ
                                                                                                                                    (1-19 Jul 66)
                                                                                                                                    2ndLt B. H. BAILEY
    &n