A. Chemical Protective Equipment (CPE) Components
The key parts of CPE include:
- The Battledress Overgarment (BDO) consisted of a coat and trousers in olive drab or camouflage pattern. The BDO has an outer cotton layer and an inner layer of charcoal impregnated polyurethane foam. It is permeable, permitting some air to filter in and outthereby reducing heat buildup, while absorbing and trapping any chemical agents coming in contact with the BDO.
- Many troops in Operation Desert Shield deployed with the Chemical Protective Overgarment (CPOG), similar in construction to the BDO, but older in design. It is solid olive drab with an outer layer of nylon cotton and charcoal impregnated foam inside.
- Army aircrews wore the Aircrew Uniform Integrated Battlefield (AUIB) instead of a normal flight suit or the BDO/CPOG. It protects against both chemical hazards and fire and includes features specialized for use in the cockpit.[8]
- Marines had four different chemical protective suits: the Marine Corps Standard Protective Overgarment (OG84), the Navy Lightweight Suit (MKIII), the Aviators Chemical Ensemble, and the British Lightweight Suit (MK IV).
- Air Force aircrews also wore the British Mark IV Lightweight Suit (MK IV).
- The 7 mil gloves are used by medical personnel, teletype operators, electronic repair personnel, etc., who need high touch sensitivity and who normally will not expose the gloves to harsh treatment.
- The 14 mil gloves are used by aviators, vehicle mechanics, and weapon crews needing some touch sensitivity but who also are unlikely to give the gloves harsh treatment.
- The 25 mil gloves are used by troops who perform close combat tasks and other heavy labor.
B. How CPE Protects Against Chemical Weapons (CW)
Before discussing how CPE is used in the field, it is useful to understand the types of chemical weapons it protects against and how. Chemical warfare agents may be delivered in various forms, including gas, liquid, or aerosol. They can be non-persistent (lasting for only minutes) or persistent (remaining effective for weeks). Chemical agent clouds can cover large areas and drift into foxholes, hatches, and bunkers to cause casualties.[17] Table 1 summarizes chemical warfare agent characteristics. Chemical Protective Equipment is designed to protect against both persistent and non-persistent agents.
Table 1. Types and Characteristics of Chemical Agents.[18]
Types of Agents |
Symbol | Persistence | Rate
of Action[19] |
Entrance | ||
---|---|---|---|---|---|---|
Summer | Winter | Vapor/Aerosol | Liquid | |||
Nerve | G-Agents | 10 min to 24 hours | 2 hr to 3 days | Very Quick | Eyes, Lungs | Eyes, Skin, Mouth |
V-Agents | 2 days to 1 week | 2 days to weeks | Quick | Eyes, Lungs | Eyes, Skin, Mouth | |
Choking | CG, DP | 1 to 10 min | 10 min to 1 hr | Slow | Lungs | Eyes |
Blister | HD,HN | 3 days to 1 week | Weeks | Slow | Eyes, Skin, Lungs | Eyes |
L | 1 to 3 days | Weeks | Quick | Eyes, Skin, Lungs | Eyes, Skin, Mouth | |
CX | Days | Days | Very Quick | Lungs | Eyes, Skin, Mouth | |
Blood | AC, CK | 1 to 10 min | 10 min to 1 hr | Very Quick | Lungs | Eyes, Injured Skin |
The special filters in the protective masks absorb airborne agents and protect the lungs and eyes. The other components of CPE protect against agent contact with the skinregardless of whether it comes in solid, liquid, or vapor form.[20] The overboots and butyl rubber gloves are impermeable and provide a solid barrier to liquid agents. A solid barrier for the rest of the body is not practical for most combat functions because it would cause the rapid buildup of body heat and moisture. Overgarments and hoods permit some passage of air and moisture through two layers, allowing perspiration to evaporate. The outer layer limits liquid absorption or redistributes it to reduce concentration. An inner layer filters the air and any vapor that penetrates the outer layer. This inner layer of charcoal-impregnated foam acts like the filter in the protective mask. Charcoal is highly porous and able to absorb liquid, gas, and aerosol agents.[21] If mask filters or permeable protective garments become exposed to a chemical agent, they are discarded (and properly disposed of) after wear and then replaced, in accordance with each services doctrine. For example, the Air Force chooses to air out vapor-contaminated CPE in a toxic free area, and then reuse them. Impermeable gloves and overboots can be decontaminated and recycled for use.[22]
Troops potentially exposed to high concentrations of chemical warfare agents (e.g., decontamination crews) receive special impermeable overgarments.[23]
Figure 2 shows the CPE prescribed for the five MOPP levels:
Figure 2. CPE Worn at Each MOPP Level.[24], [25]
Table 2 provides more detail on standard MOPP Level procedures.
Table 2. Wear of CPE by MOPP Level.[26]
EQUIPMENT |
MOPP 0 |
MOPP1 |
MOPP2 |
MOPP3 |
MOPP4 |
Overgarment and Helmet Cover | Available[27] |
Worn |
Worn |
Worn |
Worn |
Vinyl Overboot | Available |
Available |
Worn |
Worn |
Worn |
Mask and Hood | Carried |
Carried |
Carried |
Worn |
Worn |
Gloves | Available |
Carried |
Carried |
Carried |
Worn |
While in buildings and vehicles that offer some protection against liquid agents, troops may operate in a modified MOPP posture to protect against vapor threats. Some vehicles (such as the M1A1 Abrams Tank) have air pumped in through filters (overpressure systems), permitting a mask-free operation in contaminated terrain.[28] Troops assume the MOPP level set by the commander when they exit these special environments.
To maintain effectiveness in MOPP Levels 3 or 4, commanders can declare "MOPP Open." This permits troops to open the jacket and roll up the hood to improve ventilation for a limited period of time based on estimates of the chemical threat.[29]
As troops put on more protective clothing and equipment, and the MOPP level continues to increase, the time required to achieve the higher levels of protection decreases. For example, increasing the MOPP level from MOPP Level 0 to MOPP Level 1 cuts the incremental time to go to MOPP-4 in half (from eight to four minutes). Increasing the MOPP level from MOPP-1 to MOPP-2 cuts the time to go to MOPP-4 from four minutes to under a minute. Figure 3 shows the amount of time necessary to attain MOPP-4 from each lower MOPP Level.
Figure 3. MOPP Level and Time to Go to MOPP-4.[30]
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