Study Abstract: Amyotrophic lateral sclerosis (ALS) is an adult-onset, rapidly fatal neuromuscular disease of unknown etiology. ALS is a disease of high priority to the VA, particularly due to ongoing concerns about the health of veterans who served in the Gulf War. Efforts are needed to systematically identify and track veterans with ALS. Accordingly, the Department of Veterans Affairs (VA) is developing a national registry of veterans diagnosed with ALS.