In addition to the above, the Illinois Secretary of States Office will issue a free Disable Veteran License plate which has a free renewal each year to a 100% disabled veteran.
There may be an initial fee for issuance of I think $25.00 for the plate itself, but renewal thereafter each year is free.
The Illinois veterans site does not show this particular benefit - I have written them and they don't care to advertise it as a benefit on their veterans site.
You will have to go to the Secretary of States site and do a little searching to find it, but it's there.
Tammy Duckworth is kinda slipping up on the job in this regard. You might try sending her an e-mail on this, I did e-mail and snail mail. No results except a letter from a minor functionary stating all is well, move along...move along.