Civil Aid Service
|Civil Aid Services|
|Headquarters||8 To Wah Road, Yau Ma Tei, Kowloon|
|Employees||112 full time; 3,634 adult members and 3,232 youths members|
|Minister responsible||Lai Tung-kwok, Secretary for Security|
|Agency executives||Dr. Ernest S. W. Lee, Commissioner
Mr. Chi Keung Liu, Chief Staff Officer and Deputy Commissioner
- providing support to the government regular emergency forces on counter disaster activities, mountain search and rescue, flood rescue, countryside fire protection duties;
- providing crowd control and management services in major public functions;
- patrolling country parks and hiking trails and assisting people in need of help;
- staging performances to enhance public attention on major campaigns or activities organised by government departments and non-government organisations;
- providing training activities and professional services on mountain safety/rescue for government departments and non-government organisations and
CAS is funded by the Hong Kong Government and members wear uniforms.
As well, a youth section, CAS Cadet Corps, adds 3,232 volunteers to the regular 3,634 force.
The concept was introduced during British rule, an organisation also found in Britain.
CAS are headed by the Commissioner and CAS (Department) by Chief Staff Officer (also Deputy Commissioner).
Past Commissioners 
- Dr Norman Leung
- Commissioner (Grade Senior VII Officer)
- Deputy Commissioner - Ops, Admin and Support (Grade VII Officer)
- Senior Assistant Commissioner (Grade VII Officer)
- Regional (Hong Kong, Kowloon, New Territories) / Cadet Corps / Support Force Commander / Administration Force / Tactical Force (Grade VII Officer)
- Duputy Regional / Cadet Corps / Support Force Commander (Grade SVI Officer)
- Assistant Regional Commander (Grade VI Officer)
- Company Commander (Grade SV Officer)
- Deputy Company Commander (Grade V Officer)
- Platoon Commander (Grade IV Officer)
- Senior Section Leader (Grade Senior III Officer)
- Section Leader (Grade III Officer)
- Deputy Section Leader (Grade II Officer)
- Senior Member (Grade Senior I Officer)
- Member (Grade I Officer)
- Cadet / Senior Cadet / Deputy Cadet Leader / Cadet Leader / Senior Cadet Leader
- Hong Kong Training Centre - Causeway Bay
- Tai Tan Camp - Sai Kung
- Yuen Tun Camp - Sham Tseng
CAS Vehicles is managed by Transport Company. There are various types of vehicles in service for different uses including:
- Mobile Command Unit - Toyota Coaster 16 Seats
- Mountain Rescue Vehicle
- Emergency Lightening Vehicle
- Mobile Canteen
- Rescue Tender
- Coaches - Mistubishi Rosa
- Van, etc
Mountain Search and Rescue Company 
The Mountain Search and Rescue Company (民安隊山嶺搜救中隊) or CAS MSaR consists of two search and rescue teams specializing in mountain terrain within Hong Kong (mainly in the New Territories). MSaR team is made up of auxiliary members of CAS. Formed in 1967, it has a combined total of 246 members. MSaR works with Hong Kong Fire Services and Government Flying Service (air support) when deployed to incidents.
The current crest of the force was adopted in 1997 to replace most of the British colonial symbols:
- St Edward's Crown replace with the Bauhinia, Hong Kong's regional emblem
- Crest's unilingual wording CAS Hong Kong replaced with the bilingual "香港 - 民安隊 Civil Aid Service - Hong Kong"