(20 ILCS 1815/15) (from Ch. 129, par. 243)
    Sec. 15. A retired officer or warrant officer, of the Illinois National Guard, Naval Militia or Reserve Militia, or the United States Army, Navy, Marine Corps or Coast Guard, is eligible to enter or re-enter active service in the Illinois State Guard subject to the same rules as to appointment, as provided for other officers, or warrant officers, and when so entering or re-entering the service shall take the rank pertaining to the office to which he is at that time appointed. Time served on the retired list, however, shall not be used in computing length of service for qualification for longevity pay.
(Source: Laws 1951, p. 1999.)