Here is some information below.
United States Naval Station Tutuila was a naval station in Pago Pago Harbor on the island of Tutuila, part of American Samoa, built in 1899 and in operation until 1951. During the United States Navy rule of American Samoa, from 1900 to 1951, it was customary for the commandant of the station to also serve as Military Governor of the territory. Benjamin Franklin Tilley was the first commandant and the first officer responsible for the naval station's construction.
Also try contacting the Department of the Interior (DOI). They list contacts for Samoa. Please follow this link
Additionally, what your looking for may be located within NARAs RG 284 please see information below. follow the link
Naval Regulations pertaining to A History of United States Navy Regulations Governing the Use of Force to Protect the Lives and Property of Nationals Abroad:
Hope this helps,
Dear Ms. St. Angelo-Stiles,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located Laws and Codes, 1900 - 1946 in the Records of the Government of American Samoa (Record Group 284) that includes Native Lands Regulation 1900, Order No. 4, Regulation to Prohibit the Alienation of Native Land In Tutuila and Manua. This document has been digitized and may be viewed online using the Catalog.
You also may be interested in the article “Two Captains, Two Regimes: Benjamin Franklin Tilley and Richard Phillips Leary, America’s Pacific Island Commanders, 1899-1901” by Diana L. Ahmad, available online from the International Journal of Naval History, as well as A Brief Timeline of the History of American Samoa: 20th Century through the 21st Century that has been uploaded by the American Samoa Humanities Council.
We hope this is helpful. Best of luck with your research!