This week marked the 25th anniversary of the cease fire that ended the first Gulf War. During the conflict, nearly 700-thousand U-S troops were engaged. Dr. Ronald Grewenow, clinical director at the Portland V-A medical center, says the war produced fewer physical injuries than other wars, and of those veterans reporting problems, most suffered from the still-unexplainable "Gulf War Illness," which left them with fatigue and muscle pains. War-time stress is the most likely cause, but there are other possibilities too, like nerve agents or pesticides.