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The 4th 23rd Tomahawks Commander's Page

Here we will be posting communications of our former Commanders

Daily Diary Transcript
Lieutenant Colonel Clifford C. Neilson (Col. Ret.)
Commanding Officer
4th Battalion (Mechanized), 23rd Infantry Regiment, 25th Infantry Division
12 May -13 November 1968

Tay Ninh Province, Republic of Vietnam

CTZ (Combat Tactical Zone) III


The diary entries were made nightly over a 6-month period in 1968 and were transcribe in 2003-4. Although the entries are legible, the meaning of the many abbreviations, acronyms, and short hand notations within the daily entries is likely to be puzzling to a reader many years later. Some were to me and I was the writer! This transcript faithfully reproduces the entries as written in bold 14-point font. Explanatory notes for abbreviations, acronyms, and short hand notations are shown inside 14-point font brackets [...] the first time used. Historical and non-diary entry specific explanatory material providing context and technical details appear after entries in 12-point font italic. 

The diary is divided into, this Preface and 7 chapters, one for each of the months May thru November 1968 in which I commanded the Battalion and a glossary. (For Internet posting, chapters will be divided into 7-day weeks.) 

 Background of the Time and Geography Included in the Diary Entries: 

During this period, the land mass called, Vietnam, was divided into two parts. The communist-style Democratic Republic of Vietnam (DRV) (or more familiarly North Vietnam) controlled the northern part; Ho Chi Minh led the government. Its military forces were usually referred to by the US military structure as the North Vietnamese Army (NVA). The USSR and China supported the DRV both, with supplies and diplomatically. 

The ostensibly, democratic, Republic of Vietnam (RVN) (or more familiarly South Vietnam) controlled the southern part. The US military structure usually referred to RVN military land forces as the Army of the Republic of Viet Nam (ARVN) and ARVN Marines. In addition to the United States, the governments of, Australia, New Zealand, South Korea, Philippines, and Thailand supported the RVN with troops. 

Within the RVN population was a large opposition guerrilla force, the Viet Cong (VC). The VC were RVN citizens, armed, organized, and supported by the DRV who fought as guerrillas against the US and RVN regular forces. The RVN was divided into civil government entities called provinces; each province was divided further into districts. All US Military operations within RVN were under the command of the Military Assistance Command Vietnam (MACV) with headquarters in Saigon. Allied forces were under the Operational Control (OPCON) of MACV. During the period of this diary, General William Westmoreland commanded MACV. 

MACV superimposed on the RVN civil provincial structure four Roman-numeral military corps-like organizations called Field Force Vietnam (FFV). MACV assigned US and allied combat and support units to the FFV as they arrived in country and occasionally shifted these units between FFV to meet changing circumstances. Additionally, MACV assigned US military personnel as advisors to ARVN units down to company-sized units. 

All US forces within the FFV geographic area of operations, combat and advisor, were under the FFV commander. Within a FFV area, US combat units were assigned a Tactical Area of Operational Responsibility (TAOR) (frequently shortened to Area of Operations (AO).  

In 1968, III US FFV was responsible for the Provinces in which the 25th Infantry’s TAOR was located.  Major US Army units, operating in III FFV, May thru November 1968, in addition to the 25th Division, included the 1st Infantry Division, 11th Armored Cavalry Regiment, and the 199th Infantry Brigade (Bde) 

 25th Infantry Division Organization and Tactical Area of Operations 

This diary covers a period when the 25th Infantry Division TAOR, encompassed the Provinces from the north edge of the Saigon, Capital Military District, along major highways northwest of the city of Cu Chi, to the Cambodian border. The Division combat forces consisted of: 3 Bde Headquarters, 6 Infantry and 3 Mechanized Infantry Battalions, an Armored Cavalry Squadron, and 4 Artillery Battalions. It also had the normal complement of, organic combat support and service units, as well as, non- Division attached and supporting units. The combat forces were under the operational control (OPCON) of one of the three Brigades. Division and 3rd Bde headquarters were at Cu Chi, 1st Bde at Tay Ninh, and 2d Bde at Dau Tieng. During May thru November 1968, the 4th Battalion (Mechanized), 23rd Infantry Regiment (4th/23rd) was OPCON to each of the Brigades, but primarily to the 1st Bde. 

The following adapted from a “Tropic Lightning” News article:  

" In addition to screening secondary roads, the division maintained round-the-clock security operations on the extensive main routes of supply in the TAOR. These Main Supply Routes (MSR) were, Route 1, from Saigon to Cu Chi to Go Dau Hau; Route 22, from Go Dau Hau to Tay Ninh City; Route 4, from Tay Ninh City to Rau Co; Routes 13, 26 and 239 from Tay Ninh City to Dau Tieng; and Route 8A from Cu Chi to Phu Cong. The only portion of the TAOR that the Division did not enter in force during May-November 1968, was the sparsely populated War Zone “C” jungle area north of the Tay Ninh, Bau Co, Dau Tieng axis. This area was subjected, however, to extensive active surveillance, by both aerial and long-range ground reconnaissance, conducted by squad and platoon size units. Extensive, Air Force, B-52 bombing missions (nicknamed ARC LIGHT) and tactical fighter strikes were made throughout War Zone C, upon enemy base camps, supply concentrations and other targets of opportunity." 

During this 6 months of diary entries, the Tay Ninh Base Camp (TNBC) was the 4th Battalion's "Home". TNBC, located about 6 miles northwest of Tay Ninh City, was a large circular shaped, military/“city-like”, semi-permanent, garrison. It was surrounded by 3 Concertina wire (coiled, razor barbed, wire) fences interspersed with watch-towers and fighting bunkers. It was the “permanent” home for probably at least a thousand US Army and Air Force supply, maintenance, and support troops and the site of their living quarters and working facilities in RVN. In addition to US military personnel, there was a sizable contingency of non-native civilian contractors including Pacific Architect & Engineer (PAE), which provided specialized support. At the start of each day, local Vietnamese day laborers would enter the base to perform additional support tasks. And last but not least, it was the base for the Philippine Civil Assistance Group (PHILCAG).

Located within TNBC's perimeter was a large, hard surfaced airstrip capable of landing C-130 USAF aircraft; a mobile army surgical hospital (MASH); a large ammunition bunker; a Petroleum, Oil, and Lubricant (POL) "farm"; an outdoor movie theater, swimming pool, Post Exchange complex; and separate clubs for officers, non-commissioned officers, and enlisted men.  

TNBC and the personnel assigned to it, provided logistics support to the 1st Bde, 25th Infantry Division; 3 to 5 combat battalions (i.e. 4th /23rd) OPCON’ed to the 1st Bde, which operated generally in the Tay Ninh area; Special Forces camps along the Cambodian border; and occasionally to ARVN units. 

For each combat battalion, there were barracks, mess halls, and offices. Non direct-combat battalion personnel, performing duties such as personnel and supply clerks, cooks, medics, mechanics; walking wounded; personnel going on or returning from Rest and Relaxation (R&R) furlough; and soldiers either arriving or departing RVN occupied these facilities under the “watchful eye” of the Battalion Executive Officer (XO) and each Company's XO. Also, during the infrequent times when the battalion was withdrawn from combat status to rest and refit (“stood down”), these combat elements returned to TNBC to use these base camp facilities.  

Permanently assigned base camp support and combat unit personnel, when at TNBC, were responsible for its defense and took turns, manning the perimeter nightly, after their regularly daytime duties were completed. When a battalion "stood down" it provided a contingency to defend the base camp mission. 

Each day, a large re-supply convoy would leave Saigon, bound for Cu Chi, TNBC, and Dau Tieng. Convoy escort responsibility was shared by the 3rd Squadron, 4th Cavalry Regiment (nicknamed: The Three-quarter CAV); The 4th /23rd and the 1st Battalion (Mechanized)/5th Infantry (nicknamed: The First of the Fifth Mech, Bobcats). These escort duties, resulted in many combat actions during May- November 1968. 

Tay Ninh City, capital of Tay Ninh Province, was a bustling metropolis. Its primary claim to fame was being the site of the Cao Dai Temple Complex. The Cao Dai were an offshoot of the Catholic-Buddhist religion and vehemently, anti-NVA. This high-walled, temple complex could be likened to their own “Vatican City” and they fought bravely on numerous occasions to prevent the NVA from seizing it. 

The most prominent geographic landmark, in the province, was Nui Ba Den Mountain (allegedly “Black Virgin” or “Dark Lady” Mountain” in Vietnamese.) It’s western base sat about 6 miles east of TNBC. At an altitude of six thousand feet, it appeared to “thrust” out of the surrounding plain and its summit provided unparalleled observation in all directions. On the mountain’s top, was a US Army communication station, defended by a detachment of 25th Infantry Division soldiers. Around the base of the mountain, was a network of unimproved trails and rutted roads. On the lowest slopes, were banana plantations and a US Army-operated and defended, “Rock Quarry”. Everything else, between the top and bottom, was controlled by the NVA. Throughout May-November 1968, ownership of this middle layer was contested bitterly by elements of the 25th ID, including the 4th /23rd

North of TNBC and close to the Cambodian border, were the remains of a Colonial French Fort (FF). It was rebuilt and occupied by US forces. Stationed at the FF were US Special Forces units and a Battery 175mm cannon, capable of firing up to 25 miles.  Escorting re-supply convoys to FF was a frequent task of the 4th/23rd

About 30 miles northeast of TNBC was the village of Dau Tieng (DT). It housed the Michelin rubber plantation headquarters and processing facilities. The rubber tree plantations were vast and seemed to stretch in every direction for miles. Throughout the plantation area were small hamlets for the workers and used frequently as sanctuary by the NVA. DT usually housed the headquarters of the 2d Bde, 25th Division. Virtually every day, elements of the 4th /23rd, escorted the re-supply convoy from TNBC to a check-point where escort responsibility reverted to the 1st /5th Mech. After the trucks were unloaded in DT, the convoy returned to TNBC under the protection or the 1st /5th and 4th /23rd

The Organization, Equipment, and Mission
The 4th Battalion (Mechanized), 23rd Infantry Regiment.

The 4th Battalion was organized under the MTOE 7-46, 7, 8G series with: 

Headquarters & Headquarters Company (HHC). HHC had assigned the battalion staff, Reconnaissance Platoon, Heavy (4.2") Mortar Platoon, and Flame Thrower Platoon. Habitually attached: Artillery Liaison Officer and Engineer Platoon Leader.
 • Three line companies (Alpha, Bravo, Charlie). Each company had three rifle platoons and a mortar platoon. Habitually attached: artillery forward observer (FO) with the company command group and a medical person (medic) with each platoon.
 • Service & Supply Company (Delta). Delta Co had medical and supply personnel, mechanics, and cooks, some of whom were attached to the combat elements.
The battalion normally conducted daily operations from two locations:
 • The combat elements - A, B, C Companies, and the reconnaissance, mortar, and flame thrower platoons - commanded by their company and platoon leaders defended the night defensive positions (NDP), departing each morning to conduct combat operations. When an artillery unit was located at the NDP, which was the usual practice, the location was designated a fire support base (FSB). When artillery units were present, they played a vital defensive role. But, in several instances, operations were conducted from the base camp and on some occasions there were no artillery units in the NDP.
The Battalion CO, the Intelligence Officer (S2), Operations Officer (S3) and his assistant, and the Command Sergeant Major (CSM) operated from the NDP with combat elements. Usually supporting at the NDP were detachments from: the Medical Platoon with the Surgeon manning the aid station; the Mess Platoon operating a mess hall; the Maintenance Platoon, repairing equipment; and the Supply Platoon, re-supplying food, water, ammunition, vehicles and weapons.
 • The Supply and Service Elements of each organization normally operated from the TNBC. The Battalion XO commanded Battalion personnel in the camp. Assisting him, were the Delta Co. Commander, Adjutant (S1), Logistic Officer (S4), Civil Affairs Officer (S5), Communications Officer, Motor Officer, Chaplain and the Company XOs and First Sergeants.
Sometime after November 1968, changes were made to the MTOE. Among the changes, was the addition of a Combined Reconnaissance & Intelligence Platoon (CRIP)

The 4th Battalion, executed five distinct missions:

  1. Convoy escort & protection
  2. Reconnaissance in Force (RIF) (mounted and dismounted)
  3. Defense of base camps and fire support bases
  4. Airmobile assault.
  5. ARC LIGHT sweeps

AND now, begins my Diary entries:


Up 12-14 MAY 68 15-21 MAY 68 22-28 MAY 68 29 MAY- 4 JUN 68 5-11 JUN 68 12-18 JUN 68 19-25 JUN 68 26 JUN - 2 JUL 68 3-9 JUL 68 10-16 JUL 68 17-23 JUL 68 24-30 JUL 68 31 JUL - 6 AUG 68 7-13 AUG 68 14-20 AUG 68 21-27 AUG 68 28 AUG - 3 SEP 68 4-10 SEP 68 11-17 SEP 68 18-24 SEP 68 25 SEP-1 OCT 68 2-8 OCT 68 9-15 OCT 68 16-22 OCT 68 23-29 OCT 68 30 OCT-5 NOV 68 6 - 12 NOV 68 13 NOV 68