S&P Global Ratings assigned its 'AA-' underlying rating and 'AAA' program rating to Fort Stockton Independent School District, Texas' series 2018 unlimited tax-building bonds. At the same time, S&P Global Ratings affirmed its 'AA-' underlying rating on the district's existing general obligation (GO) debt. The outlook is stable. The program rating reflects our assessment of the district's qualification for, and the guarantee provided by, the Texas Permanent School Fund bond guarantee program. The program provides the security of a permanent fund of assets that the district could use to meet debt service on bonds guaranteed by the program. (For more information, please see our full analysis published Jan. 25, 2017, on RatingsDirect.) The series 2018 bonds are payable from an