Oak Ridge Research Institute for Science and Education, Knowledge Preservation Program, U.S. Army Research Institute of Environmental Medicine, Natick, MA 01760. Skaregata 3, 6002 Ålesund, Norway Ålesund, Norway. U.S. Army Institute of Surgical Research, 3698 Chambers Road, San Antonio, TX 78234. Department of Military Ergonomics and Exercise Physiology, Central Institute of the Bundeswehr Medical Service, Andernacher Strasse 100, D-56070 Koblenz, Germany. Norwegian Defence Research Establishment, N-2007 Kjeller, Norway. Department of Behavioral Sciences, Royal Military Academy, Renaissancelaan 30, Brussels, Belgium. Unite de Neurophysiologie du Stress, Departement Neurosciences et Contraintes Operationelles, Institute de Recherché Biomedicale des Armees, 91223 Bretigny-sur-Orge Cedex, France.