In Illinois it is against the law to discrimination against a person because of their military status. This means that if you are in the national guard or military reserve an employer can't refuse to hire you or otherwise engage in discrimination. A person that believes he is being discriminated against in Chicago or other parts of Illinois can file a complaint with the Illinois Department of Human Rights ("IDHR"). You are probably wondering why a company would not want to hire a person in the military? Some employers are very money oriented and see a person who is serving his country as an employee that will be gone often and the company may have to fill the position while the person is gone--and they just don't want the hassle.
I know this is a sad reason but it happens. Can you imagine not hiring a person who is fighting and ready to die for his country? Corporations in this country are getting more crazy and hostile. It is very important that you realize you have rights and these big corporations can't get away with this behavior. If people want to play hard ball, lets get a bigger bat and play hard ball right back.