330 ILCS 60/3
The term "persons in the military service", as used in this Act, shall include the following persons and no others: All members of the Army of the United States, the United States Navy, the Marine Corps, the Air Force, the Coast Guard and all members of the State Militia called into the service or training of the United States of America or of this State. The term "military service", as used in this Act, shall signify Federal service or active duty with any branch of service heretofore referred to as well as training or education under the supervision of the United States preliminary to induction into the military service. The term "military service" also includes any period of active duty with the State of Illinois pursuant to the orders of the President of the United States or the Governor. The term "military service" also includes any period of active duty by members of the National Guard who are called to active duty pursuant to an order of the Governor of this State or an order of a governor of any other state as provided by law. The term "military service" also includes the full-time duties of the Adjutant General and Assistant Adjutants General under Section 17 of the Military Code of Illinois.
The foregoing definitions shall apply both to voluntary enlistment and to induction into service by draft or conscription.
330 ILCS 60/3