A security guard (also known as a security inspector, security officer, factory guard, or protective agent) is a person employed by a government or private party to protect the employing party's assets (property, people, equipment, money, etc.) from a variety of hazards (such as crime, waste, damages, unsafe worker behavior, etc.)
armed security guard, you are responsible for protecting the people, property, and assets at your place of work. You may be required to check in visitors, walk or drive the property regularly, and monitor surveillance equipment.
Unarmed Security Guard is responsible for monitoring premises and property through physical presence and by using security and protection systems.
CCTV operators work in a control room to watch CCTV footage live on multiple screens. They may be required to watch a bank of up to 15 screens simultaneously, using a joystick, keyboard, or other controls to change the position or zoom of cameras remotely.