(a)
In general— Except as provided by subsection (b), each commissary or exchange store located on a military installation in the United States or any territory or possession of the United States that offers gasoline for commercial sale shall offer the sale of at least one fuel that contains not less than 13 percent ethanol not later than January 1, 2024.
(b)
Exception for gas stations requiring new storage tanks— A commissary or exchange store described in subsection (a) that requires the replacement of an underground storage tank to offer for sale fuel described in that subsection shall offer the sale of at least one such fuel not later than January 1, 2025.