Aid workers help people in overseas countries affected by man-made and natural disasters like wars, outbreaks of disease and earthquakes.
Army officers command, manage and motivate teams of soldiers.
Bodyguards protect individuals or groups from the risk of violence, kidnapping and other harmful situations.
Border Force officers protect UK border entry points like ports and airports, by enforcing immigration and customs regulations.
Chief inspectors manage operational teams in their districts like CID or neighbourhood policing, co-ordinating responses to major incidents.
Civil enforcement officers make sure drivers follow parking regulations on public streets and in car parks.
Coastguards help prevent the loss of life along the coast and at sea by co-ordinating and supporting search and rescue operations.
Divers work underwater at sea, or in rivers, lakes, canals and reservoirs.
Dog handlers work with specially trained dogs to help detect and prevent crime, find lost or missing people and protect property.
Door supervisors enforce the entry policy in venues like pubs, bars and nightclubs and look after the safety of the people inside.
Emergency medical dispatchers handle calls from the public and GPs requesting an ambulance.
Fingerprint officers work to identify fingerprints taken from crime scenes.
Firefighters help to protect people from fire and other dangers, and give advice on fire prevention.
Immigration officers make decisions on whether people have the right to visit or stay in the UK.
Merchant Navy deck officers look after the day-to-day running and navigation of ships, and take care of passengers and cargo.
Merchant Navy engineering officers maintain the mechanical and electrical machinery and instruments on board a ship.
Merchant Navy ratings carry out a wide range of jobs to help the day-to-day running of a ship.
Neighbourhood wardens work in local communities to reduce anti-social behaviour.
Paramedics respond to emergency call-outs and give people life-saving medical help.
Police community support officers (PCSOs) work in a neighbourhood policing team to help deal with and prevent crime.
Police officers keep law and order, investigate crime, and support crime prevention.
Prison governors manage prisons, remand centres and young offenders' institutions.
Prison instructors teach prisoners new skills to help them find work after their release.
Prison officers supervise inmates in prisons, remand centres and young offenders' institutions.
Royal Air Force (RAF) airmen and airwomen use specialist skills for support roles in defence and peacekeeping missions.
Royal Air Force (RAF) non-commissioned aircrew fly patrols over UK airspace and take part in NATO operations.
Royal Air Force (RAF) officers manage teams of airmen and airwomen. They also carry out flying duties or work in specialist ground support.
Road traffic accident investigators carry out examinations to work out why an accident happened.
Royal Marines commandos take part in frontline combat, and are sent at short notice to deal with emergency situations.
Royal Marines officers lead teams of commandos in combat situations, at sea and on land.
Royal Navy officers manage ships and submarine operations and are responsible for all personnel in their command.
Royal Navy ratings work in a variety of job roles on board ships or submarines at sea, or onshore at a naval base.
Scenes of crime officers (SOCOs) find, record and recover evidence from crime scenes.
Specialist search and rescue workers help locate and rescue people from hazardous environments.
Security managers are responsible for protecting an organisation's buildings and keeping staff and visitors safe.
Security officers make sure that buildings, valuables and people are safe and secure.
Security Service personnel protect the UK against threats to national security.
Soldiers take part in peacekeeping missions, supporting humanitarian efforts or fighting in combat zones around the world.
Store detectives prevent shoplifting in retail outlets and shopping centres.