The M109 is a U.S.-origin 155 mm tracked self-propelled howitzer family built for mobile indirect fire with armored and mechanized forces. The family spans the original short-tube vehicle, M109A1 to M109A4 rebuild and export lines, the M109A5 M284-cannon upgrade, the digitally modernized M109A6 Paladin, current M109A7 production, and the longer-barrel M109-52 concept; catalog evidence here centers on direct conflict use by U.S., Ukrainian, U.S.-led coalition, and Israeli forces.
Ukraine fielded M109-family 155 mm self-propelled howitzers after 2022 deliveries, including Norway's donated M109s and trained crews, Latvian M109s reported by Ukraine as active on the battlefield with open reporting identifying them as M109A5Oe vehicles, and U.S.-supplied M109A6 Paladins later documented in fire-support use around Robotyne.
Role detailsU.S. Army and National Guard sources document M109 self-propelled howitzers in Vietnam, including field-artillery service from fire bases and an M109 gunner assigned to Firebase Tomahawk.
Israeli-service M109s, later known locally as Rochev, are documented as entering Israeli combat service in the 1973 Yom Kippur War.
Israeli M109 battalions were documented in active service during Operation Peace for Galilee, the 1982 Lebanon War.
U.S. Army M109A6 Paladins fired support missions during Operation Iraqi Freedom, including 2008 illumination fire from Badoush prison outside Mosul and a Camp Taji Paladin battery reported to have fired thousands of rounds during the 2006-2008 rotation.
Role detailsU.S. Army M109A6 Paladin howitzers supported the anti-ISIS campaign in Iraq, with DLA imagery documenting Paladin fire missions from Al Taqaddum Air Base in June 2016.
2014 Operation Inherent Resolve imagery from U.S. Central Command and DLA documents U.S. Army M109A6 Paladin howitzers firing in Iraq from Al Taqaddum Air Base and Qayyarah West in 2016.
U.S. Army M109 howitzers deployed with armored and field-artillery units for Operations Desert Shield and Desert Storm; National Archives imagery documents 24th Infantry Division M109s loaded for Saudi Arabia, and DVIDS reports 1/201st Field Artillery M109s firing preparatory and campaign fire during the war.
Role detailsIsraeli M109 howitzers were documented in the 2023 war, including verified M109 155 mm howitzers positioned near Sderot in October 2023, 402nd Battalion M109s supporting Gaza operations, IDF-reported 411th Battalion M-109s inside Gaza for Shejaiya support, and 405th Battalion M109s later used on the northern front after earlier Gaza fighting.
Role detailsThe conflict rows use direct transfer, fielding, firing, deployment, or verified-position evidence. Broader operator lists and unsourced war lists were not used as conflict-use rows unless a source connected the M109 family to that exact conflict.
U.S. Army and National Guard sources support Vietnam fire-base service, while specialist Israeli service histories support the Yom Kippur War and 1982 Lebanon War rows.
Norwegian, Latvian, Ukrainian, U.S. defense, DVIDS, and battlefield-reporting sources support Ukrainian M109 family fielding, training, A5Oe transfer context, and Paladin fire-support use.
DVIDS, DLA, and CENTCOM imagery support Iraq and Operation Inherent Resolve firing rows; the 2023 Israel-Hamas War row separates verified M109 positioning and battalion use from claims about individual rounds fired by a named vehicle.
The M109 record is a family page rather than a single production block. It covers the original M109, A1 through A5 upgrades, the linked M109A6 Paladin, Israeli Rochev and Doher service variants, current M109A7 production, and the M109-52 longer-barrel development.
| Family branch | Reader-facing distinction | Catalog handling |
|---|---|---|
| Original M109 to A5 | Tracked 155 mm howitzers with successive gun, stowage, and reliability upgrades. | Covered in this family record. |
| M109A6 Paladin | Digitized U.S. variant with automatic fire-control, navigation, communications, and protection changes. | Linked to the separate Paladin record. |
| Rochev / Doher | Israeli-service M109 branch and 1990s upgrade path documented in Arab-Israeli combat service. | Covered as unlinked family variants. |
| M109A7 and M109-52 | Current U.S. chassis-common modernization and a longer-barrel M109-family development. | Covered as unlinked family variants until separate sourced pages are needed. |
The M109A1 is the early long-tube branch behind searches such as M-109A1 155mm. It is kept on this family page because the open conflict evidence usually names the broader M109 family or later donor variants rather than isolating a single A1 production block.
A1 references identify the longer M185 155 mm weapon in the M127 mount, replacing the original short M126 tube.
Army and technical references put M107 high-explosive range at about 18 km for the A1, compared with roughly 14.5-14.6 km for the original M109.
A1, A1B, and A1-derived rebuild context is represented here through aliases, the variant row, family specs, and source-backed Ukraine transfer notes where donor sources use the M109 family name.
The M109A5 is the A4-derived upgrade behind searches such as M-109A5 155mm. It remains on this family page because most conflict evidence groups it with M109-family howitzers, while the Latvia-to-Ukraine lane is the clearest current conflict source naming the M109A5Oe branch.
FAS identifies the A5 configuration with the M284 155 mm cannon and M182 mount, replacing the A2 to A4 branch's M185/M178 combination.
The same reference puts M109A5 maximum range at about 22 km with standard projectiles and 30 km with rocket-assisted ammunition.
Latvian transfers to Ukraine are directly sourced as M109 howitzers by Latvian and Ukrainian sources, with defense reporting identifying the six-gun batch as M109A5Oe vehicles derived from Austrian service.
This page covers the M109 family as a long-running 155 mm self-propelled howitzer line. The separate M109A6 Paladin record is linked for the digitally modernized U.S. variant.
| Variant | Configuration | Designation notes |
|---|---|---|
| A1 | M185 long-tube early upgrade | The M109A1 kept the M109 self-propelled carriage but used the longer M185 155 mm cannon/howitzer, raising maximum M107 high-explosive range from about 14.5-14.6 km on the original M109 to about 18.0-18.1 km. Sources: FM 6-88 155mm Howitzer M109 and M109A1, 155mm SPH M109, M109 155mm Self-Propelled Medium Howitzer |
| A2 / A3 | New-production and rebuilt improved models | The A2/A3 line represents improved late-Cold-War vehicles, with A3 conversions rebuilt from earlier M109A1 vehicles. Sources: M109 howitzer - Wikipedia, M109 155mm Self-Propelled Medium Howitzer |
| A5 | M284-cannon pre-Paladin upgrade | The M109A5 modified the M109A4 with the M284 155 mm cannon and M182 mount, giving the pre-Paladin branch a 22 km standard-projectile range and 30 km rocket-assisted range; Latvia's Ukraine transfer lane has been reported as the Austrian-derived M109A5Oe configuration. Sources: M109 howitzer - Wikipedia, M109 155mm Self-Propelled Medium Howitzer, Six M109A5Oe self-propelled howitzers sent to Ukraine by Latvia already in action |
 | Digitized U.S. Paladin variant | The Paladin added onboard navigation, automatic fire-control, digital communications, and improved protection to the M109 family. |
| A7 | Current U.S. modernization | BAE Systems describes the M109A7 as the latest M109 family howitzer, using major chassis and powertrain commonality with the Bradley Fighting Vehicle while retaining a 155 mm cannon mission. Sources: BAE Systems M109A7 |
| A3GN | Norwegian upgraded variant supplied to Ukraine | Norway's 2022 transfer to Ukraine involved 22 M109 howitzers from Norwegian stocks; battlefield reporting and training imagery identify the Ukrainian lane with Norwegian M109-family vehicles. Sources: Norway has donated artillery to Ukraine, Armed Forces of Ukraine train with U.S. and Norway M109 howitzer |
| Rochev / Doher | Israeli M109 and upgraded IDF service variants | Israeli M109s were locally associated with the Rochev name, while the Doher upgrade introduced improved navigation, communication, and fire-control features in the 1990s. |
M109-family howitzers fire separate-loading 155 mm ammunition, with compatibility depending on variant, fire-control integration, and projectile type.
| Ammunition | Ammunition type | Firing evidence |
|---|---|---|
 | 155 mm artillery ammunition family | The M109 is a 155 mm self-propelled howitzer family using separate-loading 155 mm ammunition; later variants remain part of the NATO-standard 155 mm artillery ecosystem. Sources: M109 155mm Self-Propelled Medium Howitzer, BAE Systems M109A7 |
 | 155 mm high-explosive projectile | The family range tables identify M107 high-explosive projectiles as a standard range reference for M109A1-A4 howitzers. Sources: M109 howitzer - Wikipedia |
 | 155 mm guided projectile | Raytheon identifies the M109 family among artillery systems compatible with the Excalibur precision-guided 155 mm projectile. Sources: Raytheon Excalibur Projectile |
 | 155 mm smoke and marking projectile | Amnesty International's evidence review placed M825/M825A1-series 155 mm white-phosphorus shells with IDF M109 155 mm howitzers near Sderot in October 2023; this supports observed artillery-shell compatibility and co-location, not a named-gun firing event. Sources: Amnesty Citizen Evidence Lab Israeli White Phosphorus Verification |
The original short-barrel M109 entered production and service as a U.S. 155 mm self-propelled howitzer for armored and mechanized formations.
U.S. field-artillery sources document M109 self-propelled howitzers in Vietnam fire-support roles during the war.
The M109A1 was the long-tube early upgrade in the family, with Army comparative data showing the M109A1's longer tube and 18,000 m maximum M107 high-explosive range.
Israeli M109s, later known locally as Rochev, are documented as seeing combat service during the Yom Kippur War.
Israeli M109 battalions were documented in active service during Operation Peace for Galilee in Lebanon.
The M109A6 Paladin brought digital fire-control, navigation, communications, and protection improvements into U.S. service.
The M109A7 modernization line entered the current U.S. family, with BAE Systems describing it as the latest M109 variant.
Norway announced that it had donated 22 M109 self-propelled howitzers to Ukraine.
Open-source evidence reviewed by Amnesty International placed IDF M109 155 mm howitzers near Sderot shortly after the October 2023 Hamas attack.
