Ill. Admin. Code tit. 44, § 40.560
b) The applicant must provide proof of eligible veteran group status. Proof must be in the form of official documentation, i.e., the DD-214 (Report of Separation) and the U.S. Department of Veterans Affairs Rating Decision Letter.
(Recodified from Section 20.560 of 44 Ill. Adm. Code 20 (Central Management Services) pursuant to Section 45-57 of the Illinois Procurement Code [30 ILCS 500/45-57], at 47 Ill. Reg. 12484)