40 ILCS 5/22-214

The pension or benefits provided for in Sections 22-207, 22-210 or 22-211 may be reduced by the Board of Trustees in an amount not exceeding 50% of any sums which a retired member of a fire insurance patrol receives under any Act of Congress or under a statute of any state providing for old age benefits, social security, unemployment insurance or other like benefits but excluding any payments of the United States or any State by reason of military or naval service.