That is a general question. I will try to give you a somewhat general answer, while being as precise as possible.
Since 1991, during the Gulf War, a combination of problems has been called the “Gulf War syndrome”. That syndrome included a number of non-subjective symptoms, found in soldiers deployed during the Gulf War. There were a lot of symptoms, such as fatigue, headaches and so on. It has been looked into a lot and there were a number of possibilities, such as exposure to the smoke from the burning oil wells—we are talking about the first Gulf War—or pesticides, or vaccines. It was a very long list. Depleted uranium was one of 15 or 20 causes. It has been studied very closely and the causes have all been discredited one by one. The studies have been done, and they have not established any link between the symptoms and the various exposure possibilities.