155mm Middle Eastern Mustard Gas Projectile

1. Overview

The 155mm Middle Eastern Mustard Gas Projectile refers to 155mm artillery projectiles filled with sulfur mustard (HD) chemical warfare agent, produced and stockpiled by several Middle Eastern nations—most notably Iraq—during the latter half of the 20th century. These projectiles represent some of the most significant chemical weapons employed in modern warfare, having been used extensively during the Iran-Iraq War (1980–1988) and against Kurdish civilian populations. Mustard gas projectiles remain a critical concern for EOD personnel, humanitarian demining teams, and military forces operating in the region due to the persistence of the agent, the large quantities produced, and the ongoing discovery of abandoned or buried stockpiles.

2. Country/Bloc of Origin

• Primary Producers: Iraq (principal user and manufacturer), Iran, Syria, Egypt, and Libya have all been associated with mustard agent programs at various points
• Iraqi Program: Iraq’s chemical weapons program, centered at facilities such as Al Muthanna and Samarra, produced tens of thousands of mustard-filled munitions from the early 1980s through 1991
• Period of Production: Primarily 1980s–early 1990s
• Technical Assistance: Iraq’s program received precursor chemicals and technical knowledge from multiple foreign suppliers; projectile bodies were often based on Western designs (French, Austrian, South African, and other 155mm howitzer ammunition patterns)
• International Context: Several Middle Eastern nations acquired or developed mustard agent capability independently, but Iraq’s program was the largest and most extensively documented

3. Ordnance Class

• Type: Chemical warfare artillery projectile
• Primary Role: Area denial and casualty production through persistent chemical contamination
• Chemical Agent: Sulfur mustard (HD), also known as “mustard gas” (despite being a liquid at normal temperatures)
• Delivery Method: Fired from 155mm towed and self-propelled howitzers (GHN-45, G5, M109, GC-45, and various other 155mm systems in Middle Eastern inventories)
• Category: Chemical munition; classified as a Schedule 1 chemical weapon under the Chemical Weapons Convention (CWC)

4. Ordnance Family / Nomenclature

• Iraqi Designations: Iraqi chemical projectiles were not always systematically designated; they are often identified by fill type, caliber, and production facility markings
• Common Identifiers:
  • Projectile bodies frequently based on the Austrian GHN-45 or South African G5 155mm HE projectile designs
  • Some based on French or other Western 155mm projectile patterns
  • Chemical fill marked by colored bands and stenciled agent codes on the projectile body
• Common Names: “Mustard round,” “HD round,” “155 chem,” “yellow band round” (in some marking conventions)
• Related Variants:
  • 155mm nerve agent (Sarin/GB, Tabun/GA) projectiles produced by the same programs
  • 130mm and 122mm mustard-filled projectiles (Soviet-pattern artillery)
  • Aerial bombs and rockets filled with mustard agent
• CWC Classification: Schedule 1 chemical weapon; illegal to produce, stockpile, or use under the Chemical Weapons Convention

5. Hazards

• Primary Hazards:
  • Chemical Agent Exposure (HD/Sulfur Mustard):
    • Vesicant (blister agent): Causes severe chemical burns to skin, eyes, and respiratory tract
    • Latent onset: Symptoms may not appear for 2–24 hours after exposure, during which time severe damage has already occurred
    • Carcinogenic: Long-term exposure is linked to increased cancer risk
    • Persistent: Mustard agent remains hazardous in the environment for days to weeks (longer in cold or sheltered conditions); thickened variants can persist for months
  • Explosive hazard: The projectile contains a bursting charge (typically TNT or Composition B) designed to rupture the casing and disperse the agent; this explosive component remains dangerous independently
  • Fragmentation: Upon detonation, the steel casing produces lethal fragmentation identical to an HE projectile
• Sensitivity Considerations:
  • Standard artillery fuzing applies; the projectile is armed by the forces of firing
  • Leaking munitions are an extreme hazard: over decades of storage or burial, casing corrosion can allow mustard agent to seep out, contaminating soil and creating contact hazards for anyone approaching
  • Mustard agent can penetrate standard materials including leather, rubber, and many fabrics
• Environmental Hazards:
  • Mustard agent contaminates soil and water sources
  • It can persist in a liquid or semi-solid state (mustard “heel”) inside corroded casings for decades
  • Polymerized mustard residue inside old munitions can still cause severe burns upon contact
• UXO Considerations:
  • Chemical UXO is among the highest-priority hazards in clearance operations
  • Any suspect 155mm projectile found in former Iraqi, Syrian, or other Middle Eastern conflict zones must be evaluated for potential chemical fill
  • Corrosion, leaking, or discolored soil near the item may indicate agent release
  • Full MOPP (Mission Oriented Protective Posture) or equivalent chemical protective equipment is mandatory when approaching suspect chemical munitions

6. Key Identification Features

• Dimensions: Standard 155mm artillery projectile dimensions—approximately 155mm (6.1 in) diameter, 600–700mm (23.6–27.6 in) overall length
• Weight: Approximately 42–46 kg (92–101 lbs) complete with fuze, depending on specific projectile design
• Shape: Standard 155mm ogival projectile profile; externally may appear identical to conventional HE rounds
• Color and Markings:
  • Critical identification feature: Colored bands. Chemical munitions are typically marked with colored bands to indicate the fill type:
    • Iraqi convention: A grey or green projectile body with colored bands; mustard-filled projectiles were often marked with one or more colored bands (band colors varied by production period and facility, but yellow bands are commonly associated with mustard fills in some conventions)
    • Markings may include stenciled agent codes, lot numbers, and production dates in Arabic
  • WARNING: Marking conventions were not always consistent in Iraqi production, and paint/markings may have degraded or been removed over time
• Distinctive External Features:
  • May have a fill plug or pour hole on the projectile body (used during agent filling), which is a key indicator of chemical fill—conventional HE projectiles are typically loaded through the base or fuze well
  • Corrosion, staining, or oily residue on the exterior may indicate leaking agent
  • The projectile body may feel heavier or lighter than expected for its size due to the liquid agent fill vs. solid explosive
• Material: Standard steel projectile casing

7. Fuzing Mechanisms

• Type: Standard artillery projectile fuzes compatible with 155mm ammunition; typically point-detonating (PD) or point-detonating with delay fuzes
• Common Fuzes Used:
  • Various PD fuzes compatible with the specific projectile design (Western-origin fuzes for GHN-45/G5 pattern projectiles, or Soviet-pattern fuzes for Eastern-origin bodies)
  • The fuze initiates a central burster charge (a tube of explosive running through the center of the agent cavity) rather than a base-detonating booster as in conventional HE rounds
• Functioning:
  • Upon impact, the PD fuze initiates the burster tube, which ruptures the projectile casing and disperses the liquid mustard agent over the target area
  • The burster charge is designed to fragment the casing while dispersing (not incinerating) the agent—the explosive yield is lower than a pure HE projectile to maximize agent dissemination
• Arming: Standard setback and spin arming consistent with the fuze type used
• Safety Mechanisms: Standard fuze safety features (bore-safe, setback/spin arming)
• UXO Note: In dud chemical projectiles, the burster charge remains intact and the fuze may be in a partially armed state; additionally, the chemical fill remains a lethal hazard regardless of fuze condition

8. History of Development and Use

Iraq’s chemical weapons program began in the late 1970s, with large-scale production of sulfur mustard commencing in the early 1980s at the Al Muthanna State Establishment and associated facilities. The program was driven by the strategic demands of the Iran-Iraq War (1980–1988), during which Iraq faced numerically superior Iranian forces and sought a force multiplier.

Iran-Iraq War Use: Iraq employed mustard-filled artillery projectiles extensively against Iranian military positions beginning in 1983. Mustard agent was used to deny terrain, contaminate defensive positions, and inflict mass casualties. The persistent nature of mustard made it particularly effective for area denial operations. Tens of thousands of chemical rounds were fired during the conflict.

Use Against Kurdish Civilians: In the Anfal Campaign (1986–1989), the Iraqi military used chemical weapons—including mustard agent and nerve agents—against Kurdish villages in northern Iraq. The Halabja chemical attack of March 1988, while primarily involving nerve agents, also included mustard agent and killed an estimated 3,200–5,000 civilians.

Gulf War and Aftermath: Following the 1991 Gulf War, the United Nations Special Commission (UNSCOM) and later UNMOVIC oversaw the destruction of declared Iraqi chemical weapons stockpiles, including large quantities of mustard-filled 155mm projectiles. However, significant quantities were unaccounted for—hidden, buried, or otherwise disposed of outside the official destruction process.

Post-2003 Discoveries: During and after the 2003 Iraq War, U.S. and coalition forces discovered thousands of pre-1991 chemical munitions, including mustard-filled 155mm projectiles, at former storage sites, buried caches, and improvised roadside bombs. The 2014 New York Times investigation revealed that at least 17 American service members and 7 Iraqi police officers were exposed to chemical warfare agents from old munitions between 2004 and 2011. ISIS fighters also reportedly discovered and attempted to use recovered chemical munitions.

Current Status: Significant quantities of Iraqi-origin mustard-filled munitions remain unaccounted for. Old chemical munitions continue to be discovered in Iraq and potentially in other regional conflict zones. These items remain extremely hazardous despite decades of burial, as sulfur mustard is remarkably persistent and the projectile casings, while corroded, still contain viable agent and explosive components.

9. Technical Specifications

Specification	Detail
Caliber	155mm
Overall Length	~600–700mm (23.6–27.6 in)
Weight (complete)	~42–46 kg (92–101 lbs)
Chemical Fill	Sulfur mustard (HD); approximately 5–7 kg (11–15 lbs) of agent per projectile
Burster Charge	Central burster tube, typically TNT or Composition B, ~0.5–1.0 kg
Agent Persistence	Days to weeks in open terrain; months to years in enclosed/buried conditions
Lethal Concentration	Skin exposure to as little as 1–1.5 grams can cause severe casualties
Agent State	Liquid at temperatures above 14°C (57°F); viscous/semi-solid below
Projectile Body Origin	Typically based on GHN-45, G5, or other Western 155mm projectile designs

10. Frequently Asked Questions

Q: How can you distinguish a mustard-filled 155mm projectile from a conventional HE round in the field? A: Key indicators include colored bands on the projectile body (particularly yellow in some marking conventions), the presence of a fill plug or pour hole on the casing (absent on standard HE rounds), stenciled chemical agent codes or symbols in Arabic, and any signs of leaking liquid, oily residue, or discolored soil around the item. However, markings may be degraded or inconsistent, so any 155mm projectile found in a known chemical weapons use area should be treated as potentially chemical until confirmed otherwise by qualified personnel with detection equipment.

Q: Is mustard agent still dangerous after decades of burial? A: Yes, extremely so. Sulfur mustard is one of the most persistent chemical warfare agents. Even after 30+ years underground, mustard agent can remain in liquid or semi-solid form inside corroded casings. The polymerized “heel” of mustard residue can still cause severe chemical burns upon skin contact. Multiple coalition service members were exposed to viable mustard agent from pre-1991 Iraqi munitions discovered after 2003.

Q: Why did Iraq choose 155mm projectiles as a delivery system for mustard gas? A: Iraq possessed large numbers of 155mm howitzers (particularly the GHN-45 and G5 acquired from Austria and South Africa) and the 155mm projectile provided sufficient internal volume to carry a militarily significant quantity of agent (5–7 kg per round). Artillery delivery also allowed chemical attacks to be conducted from standoff distances, reducing risk to Iraqi forces. The 155mm platform could deliver chemical and conventional rounds interchangeably, providing tactical flexibility.

Q: What are the immediate first-aid priorities for mustard agent exposure? A: Immediate decontamination is the top priority—remove contaminated clothing and flush exposed skin and eyes with copious amounts of water. However, because mustard damage occurs at the cellular level and symptoms are delayed, decontamination is most effective within the first 1–2 minutes of exposure. After that, damage may already be irreversible. There is no specific antidote for mustard exposure; treatment is supportive, focusing on wound care for blisters, eye irrigation, respiratory support, and infection prevention. All exposure cases require medical evacuation and professional treatment.

Q: What protective equipment is required when dealing with suspected mustard munitions? A: Full chemical protective ensemble is mandatory, including: MOPP Level 4 or equivalent (protective overgarment, mask with filters rated for chemical agents, chemical-resistant gloves, and overboots). Additionally, chemical agent detection equipment (M8/M9 paper, CAM, LCD/JCAD, or equivalent detectors) should be used to confirm or rule out agent presence. Downwind hazard areas must be established based on wind conditions.

Q: Were 155mm mustard projectiles the only chemical munitions Iraq produced? A: No. Iraq produced a wide range of chemical munitions including 122mm and 130mm artillery projectiles, 250-lb and 500-lb aerial bombs, aerial spray tanks, and 122mm rocket warheads filled with various agents including sulfur mustard (HD), tabun (GA), sarin (GB), and cyclosarin (GF). The 155mm mustard projectile was one component of a much larger chemical weapons arsenal.

Q: What is the legal status of these munitions under international law? A: Sulfur mustard and all chemical weapons are prohibited under the Chemical Weapons Convention (CWC), which entered into force in 1997. The production, stockpiling, and use of chemical weapons is illegal under international law. Iraq officially acceded to the CWC in 2009. Discovery and destruction of legacy chemical munitions is an ongoing obligation, and any found items must be reported and destroyed under international supervision.

Q: How does the burster charge in a chemical projectile differ from the explosive fill in a conventional HE round? A: A conventional HE projectile is filled almost entirely with explosive (e.g., TNT or Comp B). A chemical projectile has a large central cavity filled with the liquid agent, with only a relatively small burster tube running through the center. The burster charge is designed to rupture the casing and disperse the agent, not to produce maximum blast or fragmentation. Consequently, a chemical round detonation produces less blast and fragmentation than an equivalent HE round but creates a contaminated area that may persist for days or longer.

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⚠️ SAFETY WARNING: All ordnance and ordnance components should be considered dangerous until rendered safe by qualified EOD personnel. Chemical munitions present an extreme hazard requiring specialized training, detection equipment, and full chemical protective gear. Never handle, move, or attempt to disassemble any munition. Report all suspected chemical ordnance to appropriate military or law enforcement authorities immediately. This material is for professional educational and identification training purposes only.