(20 ILCS 1815/17) (from Ch. 129, par. 245)
    Sec. 17. Except where otherwise specified in this Act, all officers and warrant officers shall hold their respective offices until they are vacated by death, resignation, discharge, retirement, physical disability, or by acceptance of another commission in the State military service or by sentence of a General Court Martial, or findings of a board of officers. No officer below the grade of lieutenant colonel shall be permitted to remain in service longer than two years without physical re-examination. Any commander having reason to believe that an officer or warrant officer of his command has become physically unfit for duty may require such officer to take a physical re-examination; provided that no officer or warrant officer may be required to take a physical re-examination oftener than once a year.
(Source: Laws 1951, p. 1999.)