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Rock Island Arsenal M102

Towed 105mm Medium Howitzer [ 1964 ]

The M102 was the successor to the M101 series of light towed howitzer.

Authored By: JR Potts, AUS 173d AB | Last Edited: 07/02/2019 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

In 1955 the US Army issued a requirement for a new towed light howitzer to replace the M101 which was the same basic design developed in 1940 as the M2. The need was for a lighter model having a greater traverse capability. The prototype was tested in 1962 and was designated XM102, after the trials the unit was released as standardized in 1963 as the M102.

By June 1964 the weapon was deployed to South Vietnam. The US military found operating problems with many weapon systems like the M16 jamming due to the rainy climate. Likewise the M102 experienced reliability problems with non weather protected parts of the range finding system and the fire control system. After minor adjustments the issues were soon rectified.

Leaving the M114 the 155 mm gun to do the heavy lifting fire missions the M102 fit the missions of the airborne and airmobile units along with USMC units in country. Being lighter than the M101 however having a longer barrel allowed the M102 using the same ammo to have greater range. A battery was issued 6 howitzers and 3 batteries combined made a battalion. A crew of 8 serviced the weapon.

The M102 is comprised of 4 main components. The M137 cannon, the M37 recoil system, the M31 carriage and the fire-control system. A crew of 8 was needed to operate and fire the weapon. A major weapon upgrade was a roller located at the base of the tail allowing the gun to be traversed 360 degrees. In Vietnam it was necessary to engage targets in all directions with short notice as fire bases were attacked from many sides simultaneously. The US Army and USMC transported the howitzer by helicopter or parachute drop to support all types of air assault operations for US forces and the Army of South Vietnam (ARVN) military units.

The M102 is retired from front line duty however the USMC uses the gun for firing salutes. The USAF uses some models in the AC-130 Gunship.

Reported ranges for ammunition types is 12,575 yards for the M1 projectile and 16,515 for the M548 projectile. A rate-of-fire of 10 rounds-per-minute can be achieved, 3 rounds-per-minute in the sustained firing role. Traverse is 360 degrees with elevations of -5 degrees to +75 degrees.©MilitaryFactory.com
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Rock Island Arsenal, USA
Brazil, El Salvador; Guatemala; Honduras; Jordan; Lebanon; Philippines; Saudi Arabia; Thailand; Uruguay; United States
Operators National flag of Brazil National flag of Jordan National flag of Lebanon National flag of the Philippines National flag of the Kingdom of Saudi Arabia National flag of Thailand National flag of the United States National flag of Uruguay
Service Year
United States
National Origin

Base model or variant can be used to track, engage, and defeat armored enemy elements at range.
Support allied forces through direct / in-direct fire, assault forward positions, and / or breach fortified areas of the battlefield.

17.1 ft
(5.2 meters)
6.4 ft
(1.95 meters)
5.2 ft
(1.6 meters)
3,003 lb
(1,362 kg)
1.5 tons

None. This is a towed artillery piece.
Drive System
7,146 miles
(11,500 km)
Road Range

1 x 105mm main gun
Varies. Dependent on ammunition carrier.

XM102 - Prototype and Trials Model Designation
M102 - Base Production Classification Designation

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