High Quality Content by WIKIPEDIA articles! The Republic of Singapore Navy (Abbreviation: RSN; Malay: Angkatan Laut Republik Singapura; Chinese: ; Tamil: is the naval component of the Singapore Armed Forces (SAF), responsible for the defence of Singapore against sea-borne threats and protection of its sea lines of communications. Operating within the crowded littoral waters of the Singapore Strait, the RSN is regarded as one of the best in the region.[1] All commissioned ships of the RSN have the prefix RSS (Republic of Singapore Ship).