1 From the Division of Pulmonary and Critical Care, Department of Medicine, Veterans Affairs Ann Arbor Healthcare System, and the Division of Pulmonary and Critical Care, Department of Medicine, University of Michigan - both in Ann Arbor (A.S.R., C.W.D., J.J.O.); and the Airborne Hazards and Burn Pits Center of Excellence, War Related Illness and Injury Study Center, Veterans Affairs New Jersey Healthcare System, East Orange (A.M.S., M.J.F.), and the Division of Pulmonary and Critical Care, Department of Medicine (A.M.S.), and the Departments of Pharmacology, Physiology and Neuroscience, and Physical Medicine and Rehabilitation (M.J.F.), Rutgers New Jersey Medical School, Newark.