The Regional Security System (RSS) is an international agreement for the defence and security of the eastern Caribbean region. The Regional Security System was created out of a need for collective response to security threats, which were impacting on the stability of the region in the late 1970s and early 1980s. On four members of the Organisation of Eastern Caribbean States—namely, Antigua and Barbuda, Dominica, St. Lucia, and St. Vincent and the Grenadines—signed a memorandum of understanding (MOU) with Barbados to provide for "mutual assistance on request". The signatories agreed to prepare contingency plans and assist one another, on request, in national emergencies, prevention of smuggling, search and rescue, immigration control, fishery protection, customs and excise control, maritim