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| M107 (projectile) | |
|---|---|
| Name | M107 projectile |
| Type | High-explosive artillery shell |
| Origin | United States |
| Used by | United States Army, United States Marine Corps, NATO, South Korea, Israel |
| Designer | Picatinny Arsenal |
| Weight | 43.2 kg (95 lb) |
| Caliber | 155 mm |
| Length | 26.8 in (683 mm) |
| Filling | TNT |
| Filling weight | 6.86 kg (15.1 lb) |
| Detonation | Point-detonating, proximity, delay |
M107 (projectile) is a 155 mm high-explosive artillery projectile widely used by United States Army and allied forces since the 1950s. It serves as a standard general-purpose round for towed and self-propelled guns such as the M114 howitzer, M198 howitzer, and M777 howitzer, and has been employed in conflicts including the Vietnam War, Gulf War, and War in Afghanistan (2001–2021). The design emphasizes simplicity, compatibility with existing propelling charges, and mass production for sustained fire missions within NATO-standard 155 mm systems.
The M107 is a 155 mm, 39-caliber steel projectile featuring a conventional ogive body, rotating band, and base plug; it measures roughly 683 mm in length and weighs about 43.2 kg. Primary components include the steel shell body, rotating copper driving band compatible with rifled barrels used on systems like the M114 howitzer and M109 howitzer, and a 6.86 kg TNT bursting charge; fuzing options include point-detonating fuzes such as the M739 series fuze, proximity fuzes used in counter-battery roles like the Variable Time fuze, and delay fuzes for demolition effects. The projectile conforms to NATO standardization agreements, enabling interoperability with allied logistics chains exemplified by NATO Standardization Office procurement.
Development of the M107 traces to post-World War II modernization efforts at facilities including Picatinny Arsenal and Aberdeen Proving Ground to replace World War II-era 155 mm projectiles such as the M1 (155 mm howitzer shell). It entered service during the early Cold War alongside artillery platforms like the M114 howitzer and was produced in large numbers by contractors such as Frankford Arsenal and private firms later tasked under Department of Defense contracts. Modifications through the Vietnam era and Cold War reflected operational lessons from campaigns like the Korean War and doctrine updates from United States Army Field Artillery School at Fort Sill.
Units employing the M107 included field artillery battalions in the United States Army, Marine artillery battalions in the United States Marine Corps, and allied formations in NATO. Employed for interdiction, counter-battery, suppression, and area denial, M107 rounds were fired in mass during operations such as Operation Desert Storm and tactical engagements during Operation Iraqi Freedom. Fire control solutions used together with the M107 included systems like the Field Artillery Digital Tactical Fire Control System and meteorological inputs from units trained at Fort Sill to compute ballistic solutions for platforms including the M198 howitzer and tracked M109 Paladin.
In flight the M107 exhibits ballistic characteristics typical of 39-caliber projectiles; maximum effective ranges depend on charge and barrel length, reaching approximately 14.6 km from a 39-caliber tube and extended ranges with rocket-assisted variants. The TNT bursting charge produces fragmentation effects effective against soft targets, light fortifications, and materiel, while blast and overpressure can suppress infantry within area effects documented in after-action reports from Vietnam War engagements and later conflicts. Accuracy relies on conventional ballistic correction methods; circular error probable values reflected dispersions inherent to unfuzed conventional projectiles versus modern precision-guided munitions like the XM982 Excalibur.
Several iterations and modifications of the M107 envelope include insensitive-munition compatible fills, base-bleed additions for range extension, and integration with variable time proximity fuzes for airburst effects similar to concepts used with rounds like the M712 Copperhead artillery-guided munition. Some navies and armies adapted M107 bodies to accept improved bursting charges or specialized submunitions, while NATO interoperability programs encouraged standardized driving band metallurgy and fuze threads aligning with rounds such as the M795 (155mm projectile). Rocket-assisted projectiles and guided artillery shells represent doctrinal shifts away from basic M107 employment.
Storage and transportation of M107 projectiles follow guidelines from the Department of Defense and explosive safety criteria established by organizations such as the NATO Logistics Committee; magazines and depots like those at Anniston Army Depot implement temperature control, segregation of fuzed rounds, and periodic surveillance. Handling protocols require trained ordnance personnel from units certified under programs at Redstone Arsenal or Dugway Proving Ground, use of approved lifting equipment, and strict adherence to fuze safety procedures to prevent sympathetic detonation incidents similar to historic munitions accidents documented in service safety boards. Demilitarization and disposal follow procedures promulgated by entities such as the U.S. Army Corps of Engineers.
From the 1990s onward, the M107 has gradually been supplemented by improved munitions such as the M795 (155mm projectile), precision rounds like the XM982 Excalibur, and insensitive-munition designs driven by acquisition programs from Program Executive Office Ammunition. Modernization efforts within NATO and U.S. Army Futures Command doctrines favor extended-range and precision-guided artillery, leading to reduced reliance on pure high-explosive rounds in favor of capabilities demonstrated in programs at Picatinny Arsenal and joint development with allied firms in France, United Kingdom, and Israel. Nevertheless, stockpiles and legacy systems kept M107 rounds in service as economical general-purpose ammunition into the early 21st century.
Category:Artillery shells Category:155 mm artillery