Singapore has a SAR responsibility within Singapore FIR(Flight
Information Region) which is rather far out into the South China
Sea. Had a friend that used to be a winchman or something of that
nature. Told me other than military rescues, they also do cilivian
emergency evacs of sailors from ships out at sea. These cases
usually are sailors falling ill, injuring themselves while at work
or sometimes even injury from drunk fighting while out at sea.
There is a map of Singapore's SRR (Search and rescue region) in
pdf file below.
http://www.caas.gov.sg/caasWeb/export/sites/caas/en/Regulations_And_Guidelines/Rules_and_Regulations/ATS/AIP/general/gen3/GEN3.6.pdf
