65 ILCS 5/10-1-16
Persons who were engaged in the active military or naval service of the United States for a period of at least one year and who were honorably discharged therefrom and all persons who were engaged in such military or naval service who are now or may hereafter be on inactive or reserve duty in such military or naval service, not including, however, persons who were convicted by court-martial of disobedience of orders, where such disobedience consisted in the refusal to perform military service on the ground of alleged religious or conscientious objections against war, shall be preferred for appointments to civil offices, positions, and places of employment in the classified service of any municipality coming under the provisions of this Division 1, provided they are found to possess the business capacity necessary for the proper discharge of the duties of such office, position, or place of employment as determined by examination. For purposes of this Section, if a person has been deployed, then "active duty military or naval service of the United States" includes training and service school attendance, as defined in 10 U.S.C. 101(d), which is ordered pursuant to 10 U.S.C. 12301(d).
The civil service commission shall give preference points for original appointment to qualified veterans whose names appear on any register of eligibles resulting from an examination for original entrance in the classified service of any municipality coming under the provisions of this Division 1 by adding to the final grade average that they receive or will receive as the result of any examination held for original entrance, 5 points. The numerical result thus attained shall be applied by the civil service commission in determining the position of those persons on any eligibility list that has been created as the result of any examination for original entrance for purposes of preference in certification and appointment from that eligibility list. Persons who were engaged in the active military or naval service of the United States for a period of at least one year and who were honorably discharged therefrom or who are now or who may hereafter be on inactive or reserve duty in such military or naval service, not including, however, persons who were convicted by court martial of disobedience of orders where such disobedience consisted in the refusal to perform military service on the ground of alleged religious or conscientious objections against war, and whose names appear on existing promotional eligible registers or any promotional eligible register that may hereafter be created, as provided for by this Division 1, shall be preferred for promotional appointment to civil offices, positions and places of employment in the classified civil service of any municipality coming under the provisions of this Division 1.
The civil service commission shall give preference for promotional appointment to persons as hereinabove designated whose names appear on existing promotional eligible registers or promotional eligible registers that may hereafter be created by adding to the final grade average which they received or will receive as the result of any promotional examination seven-tenths of one point for each 6 months or fraction thereof of active military or naval service not exceeding 30 months. The numerical result thus attained shall be applied by the civil service commission in determining the position of such persons on any eligible list which has been created or will be created as the result of any promotional examination held hereunder for purposes of preference in certification and appointment from such eligible list.
No person shall receive the preference for a promotional appointment granted by this Section after he or she has received one promotion from an eligible list on which he or she was allowed such preference.
No person entitled to preference or credit for military or naval service hereunder shall be required to furnish evidence or record of honorable discharge from the armed forces before the publication or posting of any eligible register or list resulting from the examination. Such preference shall be given after the posting or publication of any eligible list or register resulting from such examination and before any certifications or appointments are made from such list or register.
65 ILCS 5/10-1-16