Many Gulf War veterans have experienced a variety of physical symptoms, collectively called Gulf War illnesses. In response to veterans’ concerns, the Department of Defense established a task force in June 1995 to investigate those incidents and circumstances related to possible causes of these unexplained illnesses. The Office of the Special Assistant assumed responsibility for these investigations on November 12, 1996, and continues to gather information on environmental and occupational exposures during the Gulf War and their possible effects on the health of the troops who served there.
To inform the public about the progress of this office, the Department of Defense publishes (on the Internet and elsewhere) accounts related to the possible causes of illnesses among Gulf War veterans, along with documentary evidence or personal testimony used in compiling the accounts. The following is a summary of the reports we have published concerning our investigations into environmental and occupational exposures.
We are all exposed to chemicals in the air we breathe and in the food and water we consume every day. Some of these chemicals are man-made while others occur in nature. Someone living in a rural area will be exposed to different chemicals than someone who lives in a large city. Proximity to farms and industries, prevailing winds, and sources of food and water are some of the variables that affect the types and levels of chemicals in our environment. Furthermore, all environmental media can be affected; that is, air, water and soil can become repositories for chemicals released on a daily basis from human activities and natural actions. As a result, we are exposed to chemical contaminants on a continuous basis in our everyday lives.
Our occupations often expose us to chemicals, too. A factory worker may be exposed to all the chemicals used in the factory, more so to those specific chemicals he or she works with every day. Occupational exposures can potentially be more severe than other types of environmental exposures because the concentrations of chemicals encountered in an occupational environment tend to be much higher than in the ambient environment, and individual workers are exposed to these higher levels of chemicals over longer periods.
Several factors combine to determine an exposure’s potential for causing illness: the toxicity of the chemical, the concentration of the chemical, and the duration of exposure are important factors for the potential for causing illness. An individual’s susceptibility to the chemical adds another variable.
Occupational exposures are usually calculated for a 40-hour workweek, 50 weeks a year, over a 40-year working life. Human health effects from chemical exposures are determined from actual incidents experienced by people in occupations where they are routinely exposed to toxic chemicals, or are estimated based on studies involving animals in controlled laboratory environments.
U.S. military personnel who served in the Gulf War were not only exposed to chemicals in the ambient environment; they were also exposed to chemicals associated with their occupational activities. For example, pesticides were widely used to control insects, rodents, and other disease-carrying pests. These pesticides were applied where veterans worked, ate, and slept. Some subgroups of the general military population, that is, applicators who were involved in the day-to-day handling and use of pesticides, and who did not wear personal protective equipment, may have been exposed to certain pesticides above levels considered safe for human health. This is a concern because if improperly used, pesticides have the potential to cause adverse health effects. That is, pesticides that were used improperly may have created exposures above recommended limits – for example, the use of some pesticides formulated for use only in an outdoor environment were sometimes used indoors. Such use could have resulted in overexposures.
The Office of the Special Assistant has investigated the potential for human health effects arising as a result of exposure to pesticides and a number of other environmentally and occupationally related factors experienced by some US military personnel during the Gulf War. These investigations have resulted in the preparation of environmental exposure reports that discuss the issues and facts surrounding specific exposures. Some of these reports also estimate the likelihood that long-term adverse health effects could result. The reports are divided between environmentally and occupationally related exposures. Environmentally related issues included oil well fire smoke, particulate matter, and contaminated water. Occupationally related issues included pesticides, chemical agent resistant coating (CARC) paint, retrograde contaminated equipment, and depleted uranium.
All of the environmental and occupational related reports prepared by the Office of the Special Assistant have been published on the Department of Defense’s GulfLINK Web site and are briefly discussed in the following paragraphs.