When It will come specifically to amyotrophic lateral sclerosis (ALS), often called Lou Gehrig’s condition, veterans who show active, steady company of 90 days or even more usually are presumed to own formulated the illness because of their military service. believable, credible - able to staying thought; "entirely credible testimony"; https://www.repforvets.com/more-cancers-now-presumptive-for-service-connection/