Civil Defence Auxiliary Unit
The Civil Defence Auxiliary Unit (CDAU) is part of the Singapore Civil Defence Force (SCDF) consisting of uniformed volunteers. The volunteering programme in SCDF was first started in 1982 under the National Civil Defence Plan and Volunteer Scheme which provided an avenue through which residents can volunteer their service in civil defence roles within their local community.
Source: Wikipedia — Civil Defence Auxiliary Unit (CC BY-SA 4.0)