48 U.S.C. § 432
“Upon the fifteenth and thirtieth and fortieth anniversaries of the effective date of this Compact, the Government of the United States and the Government of Palau shall formally review the terms of this Compact and its related agreements and shall consider the overall nature and development of their relationship. In these formal reviews, the governments shall consider the operating requirements of the Government of Palau and its progress in meeting the development objectives set forth in the plan referred to in Section 231(a). The governments commit themselves to take specific measures in relation to the findings of conclusions resulting from the review. Any alteration to the terms of this Compact or its related agreements shall be made by mutual agreement and the terms of this Compact and its related agreements shall remain in force until otherwise amended or terminated pursuant to Title Four of this Compact.