The document discusses Singapore's Total Defence Day 2015 and the role of the Singapore Armed Forces (SAF) in defending the nation. The SAF works to deter attacks on Singapore by maintaining a defence force. It relies on National Service to recruit National Servicemen (NSFs) and keep the SAF strong and ready to face challenges. The purpose of Total Defence Day and this document is to consider how civilians can support and strengthen Singapore, just as the SAF does through its efforts.