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| M18 Claymore | |
|---|---|
| Name | M18 Claymore |
| Type | Directional anti-personnel mine |
| Origin | United States |
| Service | 1960s–present |
| Used by | United States Army, United States Marine Corps, NATO, South Korea, Israel, Thailand |
| Manufacturer | Technical Products Division, Rocky Mountain Arsenal; later companies |
| Weight | 3.5 kg (7.9 lb) |
| Length | 216 mm (8.5 in) |
| Width | 38 mm (1.5 in) |
| Height | 124 mm (4.9 in) |
| Cartridge | C-4 explosive with steel ball bearings |
| Effective range | ~50 m lethal, 100 m scattering |
| Detonator | Electric blasting cap or tripwire |
M18 Claymore is a directional anti-personnel mine developed by the United States in the early Cold War era. Designed to project a fan-shaped spray of metal fragments, it serves as an area-denial and ambush weapon for infantry units and engineering detachments. The device achieved widespread use in conflicts from the Vietnam War through present-day operations, influencing infantry tactics, countermine measures, and international arms control debates.
The device consists of a molded plastic case containing a linear charge of C-4 plastic explosive and a matrix of embedded steel ball bearings. The curved face focuses the blast into a roughly 60° horizontal arc with an approximate 2 m vertical dispersion, producing a dense pattern of high-velocity fragments out to about 50 m; fragments occasionally cause injuries beyond that distance up to 250 m in rare circumstances. The unit is typically mounted on a foldable bipod and aimed using a simple sight on the top of the casing; it is fired electrically via an electric blasting cap powered by a firing device or battery. Common firing devices include the M57 firing device and the M42 firing system; initiation methods also incorporate tripwires and command-detonated switches used by United States Army Rangers and United States Marine Corps squads. The case bears the embossed label directing the operator away from the convex side; the mine’s dimensions and mass make it man-portable for use by infantry platoon elements and combat engineer teams.
Work on a directional anti-personnel mine in the United States followed lessons from World War II and early Cold War engagements, seeking an infantry weapon to deliver controlled fragmentation similar to a shotgun pattern. The project drew on expertise from the Ordnance Corps and industrial firms associated with the Rocky Mountain Arsenal and the Picatinny Arsenal. After testing and doctrinal evaluation, the weapon entered service in the 1960s and was adopted by the United States Army and allied forces including NATO partners; export followed to states such as South Korea and Thailand. The design influenced parallel developments like the PMN and directional charges studied by NATO technical committees. Field feedback from units such as 1st Cavalry Division (Airmobile), 101st Airborne Division, and Marine Expeditionary Units led to procedural updates and accessory development to improve emplacement, aiming, and safe transportation.
The mine first saw widespread combat use during the Vietnam War, where it became a standard defensive and ambush munition in counterinsurgency and perimeter defense roles. Units used the device for night ambushes, checkpoint protection, and base perimeter security during operations like Operation Junction City and patrol bases around the Mekong Delta. Subsequent conflicts where the weapon appeared include the Yom Kippur War through exported stocks to Israel, clashes during the Korean DMZ incidents, and later operations in Iraq War and War in Afghanistan (2001–2021), where improvised employment with remote firing systems and command-detonated arrays was documented. Tactical manuals from the Department of the Army and after-action reports from units including Special Forces and Ranger Regiment detail emplacement patterns, standoff distances, and integration with observation posts and fields of fire.
Standard operating procedures require strict controls over arming, emplacement, and firing to prevent fratricide and civilian casualties. The mine is kept in a safe orientation until emplacement; operators attach an electric blasting cap, ensure the firing circuit is clear, and establish control measures such as safe corridors and warning sectors. Engineering and explosive ordnance disposal units like Explosive Ordnance Disposal (EOD) teams follow established render-safe procedures for unexploded or misfired units, often employing remote techniques and burn-in-place decisions under Rules of Engagement and force protection protocols. Accidental detonations during training and combat led to revisions in training under United States Army Training and Doctrine Command and influenced personal protective equipment guidance for combat medics and infantry.
Several official and improvised variants and accessory kits emerged over time. Commercial and military suppliers produced alternate firing devices, non-electric firing kits, and safety clips; some forces developed scatterable and vehicle-deployed adaptations. Field modifications included linkage into remote firing networks and integration with tripwire initiators for perimeter applications seen in deployments by United Kingdom Armed Forces and Canadian Armed Forces. International variations—driven by local manufacturing and export regulations—appeared in inventories of Republic of Korea Armed Forces and Israeli Defense Forces, occasionally incorporating different fragmentation materials or casings. Contemporary research in controlled fragmentation and non-lethal alternatives prompted studies at institutions like Sandia National Laboratories and Aberdeen Proving Ground.
Doctrine governing use appears in tactical manuals and training syllabi from United States Army Maneuver Center of Excellence and Marine Corps Warfighting Laboratory, emphasizing integration with observation posts, sectors of fire, engagement criteria, and legal considerations under international humanitarian law as interpreted by the United Nations framework. Live-fire ranges and simulation programs at facilities such as Fort Benning, Fort Bragg, and Camp Lejeune train soldiers and marines in emplacement, aiming, and firing procedures, while Explosive Ordnance Disposal School courses cover render-safe and disposal techniques. After-action reviews from units involved in Operation Iraqi Freedom and Operation Enduring Freedom continue to refine tactics, techniques, and procedures to mitigate collateral damage and enhance force protection.
Category:Anti-personnel weapons