What are the requirements for hiring a personal bodyguard?

A friend of mine just got promoted to become the manager of his company. Part of the package with this promotion is that the company would pay for a personal bodyguard for him.

Now, he has to hire a personal bodyguard. What are the things to check for in a qualified and competent personal bodyguard? What are the specific requirements and qualifications for someone to be a personal bodyguard?

1. Training on security measures - the personal bodyguard should have documents that show that he/she underwent training. Preferably one that specialized in personal security skills.
2. Experience - the person should have experience of having been a personal bodyguard to another person. The person must have given them a great recommendation.
3. Belonging to a particular agency - there are those security agencies or organizations that security officers are part of. You should hire from such agencies.

A personal bodyguard must have good temperament level. He should also be very observant, intuitive and very alert.