I got my percentage from the VA, after 3 assessments at 3 different VA hospital (my paperwork got messed up/lost the first two times). I wrongly thought that the percentage was based off of the pay grade a person had while in the military. Probably from confusing military retirement percentage with disability percentage. Don't think the Army directly pays disability. Might have been so in the past but I don't recall that ever being an option when I got out. The Army (well, doctors at an army hospital on For Hood) did my initial medical assessment when I ETS'd but that was a pre-assessment for the VA if I remember correctly. I believe they gave me some forms and told me to take it to the VA rep on base. I am certain my disability comes from the VA though. I get a letter from them every year saying I'm exempt from the non-insured Obamacare tax penalties due to my VA benefits.