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Only Easy Day Was Yesterday" Navy SEALs (Sea, Air & Land)" (PDF). America's Navy. USNavy. Dicapai pada 26 January 2019. "US joins battle as Philippines
Heritage Command Online Library of Selected Images: U.S. Navy Ships – Listed by Hull Number: "SP" #s and "ID" #s — World War I Era Patrol Vessels and other Acquired
official U.S. Navy website Diarkibkan 29 Jun 2011 di Wayback Machine, "armed forces" is capitalized when preceded by "United States" or "U.S.". Templat:Uscsub
United States Navy. 15 Mei 2018. NNS180515-04. Diarkibkan daripada yang asal pada 16 Mei 2018. Dicapai pada 15 Mei 2018. "U.S. Navy Launches the Future