A security guard and a professional bodyguard are two very different categories. Firstly, a security guard performs the procedures of "low" level security. This is providing security at a shopping center, a car parking lot, or a nightclub, for example. This is where the security level is low and there is no risk of people being killed.
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The typical background of a professional bodyguard is usually [that] of Military Special Forces, or a Government Security Intelligence or Law Enforcement Agency background, where they have gained a good knowledge of high-level security. A number of agencies such as ourselves are also using psychiatrists, as they are very good judges of [character] when it comes to immediately determining whether a person is a threat or not to a client.