20 ILCS 1805/42
Whenever a recommendation is made pursuant to the provisions of the preceding Section and such recommendation is approved by superior commanders, it shall be within the discretion of the Adjutant General to convene a board of not less than three nor more than five commissioned officers all superior in rank or date of rank to the officer or enlisted member facing investigation to examine into the matter of such recommendation and the desirability and qualifications of the officer or enlisted member who is the subject thereof, and to report its findings and recommendations to the Adjutant General. If the board finds such officer to be undesirable and such findings are approved by the Adjutant General , then the commission of such officer or enlistment of such soldier or airman, in the Organized Militia, shall be terminated.
20 ILCS 1805/42