This article from the San Diego Union describes many of the VA programs covering disability. Often there is overlapping eligibility for Social Security Disability payments, claimants can apply for both.
“The trick is not to wait for a crisis. If your mom or dad is a veteran, I suggest you phone member services at the VA San Diego Healthcare System today to make sure your parent is enrolled with the local VA. At the same time, get a list of programs your parent might be eligible for now or later. If it’s too early to sign up for some of the programs, at least you won’t need to start from scratch when the time comes.”
See full article here: