Secretary of Defense William S. Cohen (left) is briefed by Marine Col. Maston Robeson (center) and Col. Richard Zilmer (right) as he observes a live-fire training exercise conducted by Marines of the 15th Marine Expeditionary Unit at the Udairi Training Range in northern Kuwait on April 8, 2000. Cohen is in the Persian Gulf region to meet with U.S. troops stationed there and defense leaders of the Gulf region. Robeson is Cohen's junior military assistant. Zilmer is the commander of the 15th Marine Expeditionary Unit.