48 U.S.C. § 312

“The Government of the United States has full authority and responsibility for security and defense matters in or relating to Palau. Subject to the terms of any agreements negotiated pursuant to Article II of this Title, the Government of the United States may conduct within the lands, water and airspace of Palau the activities and operations necessary for the exercise of its authority and responsibility under this Title. The Government of the United States may invite the armed forces of other nations to use military areas and facilities in Palau in conjunction with and under the control of United States Armed Forces.