There are very few occupations that require a person to run into danger instead of away from it. A police officer can not hesitate or panic in life-or-death situations. If the thought of getting shot at, spit on, or physically assaulted makes you quake in your shoes, this occupation isn't the right one for you. While you will receive the training that you need in order to handle yourself in various situations, you need to be able to stand and face what others would flee from.
While we tend to only hear and read about corrupt, ineffective police officers, there are thousands more that we never hear of. These are the men and women who were made for the job; those that perform their jobs with integrity and honesty. If you possess the five qualities above and are thinking of becoming a police officer, you're making a great choice.