48 U.S.C. § 324

“In the exercise in Palau of its authority and responsibility under this Title, the Government of the United States shall not use, test, store or dispose of nuclear, toxic chemical, gas or biological weapons intended for use in warfare and the Government of Palau assures the Government of the United States that in carrying out its security and defense responsibilities under this Title, the Government of the United States has the right to operate nuclear capable or nuclear propelled vessels and aircraft within the jurisdiction of Palau without either confirming or denying the presence or absence of such weapons within the jurisdiction of Palau.