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15th Field Artillery Regiment
1917 - 2008

15
The 15th Field Artillery motto - ALLONS - Let's Go!
Allons!

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15th Field Artillery Regiment crest

15th Field Artillery Regiment
1917 - 2008

15
The 15th Field Artillery motto - ALLONS - Let's Go!
Allons!

WW1   WW2   Korea   Vietnam
  Panama   Bosnia   Iraq  Afghanistan

'Fighting 15th'

15th FDC
Home    Links
Site map
Search site
Terms of use
Membership
Welcome

Commo
What's new
Newsletter
Submissions
Announcements
Reunions
Contact us

Guestbook


We support

our troops

15th HQ
 1917-Present

15th FAR
Campaigns

Commanders

Crest
    Salute
Decorations
15th PX

World War 1
15th FAR
Awards
Campaigns

Decorations

Memoirs

Photos
  [2]
Scroll of Honor

Pre-WW2
15th FAR
Photos

World War 2
15th FAR
Awards

Campaigns

Decorations

Scroll of Honor

Post-WW2
15th FAR

Korean War
15th FAR
Campaigns

Decorations

Hoengsong

Photos

Scroll of Honor

Time Line
1LT Hartell

Post-Korean
War
15th FAR

6/15 Vietnam
6/15 HQ
Campaigns

Decorations
History
Photos
[2] [3]
[4] [5]
2LT Durham

Scroll of Honor

7/15 Vietnam
7/15 HQ
Articles
Awards
Campaigns

Decorations

Diary

Big Guns

Fire Mission
History
Map Room
Photos
-People
-Places
-Things
-The Guns
-More Photos
-Mini-reunions
USNS Walker
Scroll of Honor

Vietnam War
15th FAR
Artillery
Artillery Safety
Artillery Stories

Artillery Units

-XXIV Corps
-23d Group
-41st Group
-52d Group
-54th Group
-97th Group
-108th Group
Christmas

Dave Rabbit

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-
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1LT Hartell
2LT Durham

Honoring 
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Heroes
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1LT Kalsu
Remembrance

Vet Info 
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Agent Orange [2]
Artillery Ears

Discharges

Drug / Alcohol
Experimentation
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"BIG GUNS ARE READY"

Weapon Systems used by the
7th Battalion, 15th Field Artillery
during the Vietnam War

Written by: Dan Gillotti, 15th Historian

cannon_face2_clr.gif (5509 bytes)

Background recording compliments of Sgt James R. Claeys ("29er Charlie") Pleiku-An Khe (1969-70) 6/29 Arty & 2/11 Arty

    

INDEX

Introduction

When the 7th Battalion (Bn), 15th Artillery (Arty) prepared for deployment to Vietnam in late 1966, it was armed with 8-inch Self-Propelled (SP) Howitzers designated as the US Army model M110. The 8-inch howitzer was the most accurate artillery weapon system in the US Army’s arsenal. It was capable of firing a 200 pound High Explosive (HE) projectile to a maximum range of 16,800 meters (10 miles). Its best known feature was its ability to hit "Point Targets" with consistent accuracy.

Many of the fire missions fired by the Indianheads of the Fighting Fifteenth were against heavily fortified and well-camouflaged enemy bunker complexes. In many instances, the infantry troops would walk right through an enemy bunker complex and would be caught in fierce enemy crossfire from the fortified bunkers. The most effective tactic to employ when this situation occurred was to pull the troops back and request a single-gun Precision Destruction Fire Mission. A trained Forward Observer (FO) could "walk" those big 200-pound rounds right in on top of the bunkers and neutralize them.

An 8-inch round tipped with a Delay or Concrete Piercing fuze was the most effective Bunker Buster in the Vietnam combat zone. However, because of the force of the large projectile, it was not safe to fire close to friendly troops as shell fragments could hit them. But in many instances the combat situation dictated the use of this weapon system near friendly troops after all the alternatives were considered.

The message sent to the troops on the ground during these situations was "Danger Close". This was not news to the Grunts (infantrymen), because when the enemy was about to overrun your position you will throw everything possible (including the kitchen sink) at him to stop him. "Danger Close" to the Grunts meant they could smell the "Nuoc Mam" fish sauce on the enemy’s breath. 

Dan Gillotti and his FADAC during the 1968 Tet Offensive

Dan Gillotti worked his FADAC computer 
for over 36 hours during TET '68

Technical details

The M110 weighed approximately 52,000 pounds and was powered by a General Motors supercharged diesel engine with a top speed of approximately 35 miles per hour. A pump that ran off the main engine supplied hydraulic power. The hydraulic power was used to raise, lower, and traverse the tube, to lift and load the projectile into the breech, and to operate the huge hydraulic spade used to stabilize the weapon when it recoiled during firing.

8inchCyclops.jpg (51499 bytes)

M110 Howitzer

The chassis, platform, and power train used for this weapon system were extremely versatile. In a matter of a few hours, an experienced Ordnance crew could remove an 8-inch Howitzer barrel and replace it with a 175mm Gun Barrel. In October of 1967, C Battery, 7th Bn, 15th Arty was located at LZ Pony and became the first element of the Battalion to have two of its Howitzers retubed as 175mm Guns. When configured with a 175mm Gun barrel the system designation was then called the model M107.

I’ll attempt explain the differences between the two weapons in easily understood terms. The ballistic differences between a Howitzer and a Gun are that when an 8" Howitzer was fired, the round traveled along an "arching" trajectory until it hit the target. However, when a 175mm Gun was fired, it moved a 147 pound projectile at a very high velocity (approximately 3,000 feet per second), and consequently had a very "flat" trajectory.

With the addition of a 175mm Gun tube, the "Indianheads" were able shoot out to a range of 32,800 meters (20 miles) which was twice as far as the 8-inch Howitzers. Because of its high velocity, the 175mm Gun was used primarily against "Area Targets". Because of its high velocity the 175mm Gun had the reputation of being somewhat erratic. It could be temperamental if not used properly. But in the hands of a good gun crew, who serviced and maintained the weapon according to the specifications, kept the powder temperatures at a fairly constant level, kept the rounds clean, ensured a uniform depth of ram was achieved, kept the bore clean, and combined this with a good Fire Direction Center (FDC) crew and current meteorological data, you could in fact "hit the broad side of a barn". 

Message on a 175 round

An artilleryman sends a
personal message to the
enemy, "Sorry 'bout that!"

A 175mm Gun barrel only had a life of 300 Full Service Rounds when firing the maximum charge of Zone 3, and would then have to be replaced. Later in the Vietnam war, new tubes with longer lives were introduced extending their use to between 700 and 1,200 Full Service Rounds at Zone 3. Needless to say, the 7th Bn, 15th Arty became quite adept at quickly changing barrels after firing over 360,000 175mm and 8-inch rounds. If you needed accuracy and a "Big Bang", then you called for the 8-inch Howitzers. When you needed long range, you called on the 175mm Guns. 

M107 in the LZ Diamondhead
motor pool for maintenance
Photo: Dave Holdorf

One fact you could take to the bank. . . when you called on the Indianheads of the Fighting Fifteenth for Heavy Artillery support you got "Deadly and Accurate Firepower."  Allons!

Written by: Dan Gillotti, 15th Historian


   

M110 Technical Manual

 Many thanks to Charles Hurst for sending these files! 

You will need Adobe Acrobat Reader installed on your computer to view these files. There are several places to download a free version of the software, including the IRS web site and the link below. 

Click here for free Reader
Adobe logo.gif (897 bytes)

   

8-Inch Howitzer Technical Manual

Excerpts from: OPERATOR'S MANUAL
HOWITZER, HEAVY, SELF-PROPELLED
8-INCH, M110A2  -  TM 9-2350-304-10

Headquarters, Department of the Army, April 1990
   

Charges Tracks
Gunner Controls Projectiles
Equipment Data Projectile Markings
Files & Photo Credits: Charles Hurst
Background photo is the 10,000th round being fired by the 7th Battalion/15th Field Artillery in 1967 at LZ Diamondhead, RVN

     

 

MAINTENANCE OF THE BIG GUNS:
   

Retubing a gun

Retubing a 175mm

175mm retube

Retubing a 175mm gun
Photos: Don Aird
   

   

______________________________________
   

[Complete list of US Army Vietnam artillery units]
[home]  [site map]  [contact us[
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[WW1]  [WW2]  [Korean War]  [Vietnam War]  [Iraq War]
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Attention 15th Field Artillery veterans!

Contact Davo with your unit information.
   
Copyright 1998-2009   LANDSCAPER.NET   All rights reserved.
Last modified 03 December 2012

______________________________________
   

[Complete list of US Army Vietnam artillery units]
[home]  [site map]  [contact us[
guestbook]  [welcome]  [search site]  [terms of use]
[WW1]  [WW2]  [Korean War]  [Vietnam War]  [Iraq War]
[what's new]  [links]  [announcements]  [15th reunions]
   

Attention 15th Field Artillery veterans!

Contact Davo with your unit information.
   
Copyright 1998-2009   LANDSCAPER.NET   All rights reserved.
Last modified 31 October 2016