Personally I don't want to be one. The pay is to low, and the thought of just walking around a store all day, or standing by some doors for 8 hours a day doesn't seem to be appealing. But if you are looking for some reasons that you could use for like an interview, its not something somebody can rlly help you with. You have to reach down deep and think hard. Why do YOU want to be a security officer? What makes it appealing? Why do you think, you would be good at it?