It's also required by police officers, or by fire fighters. If you're defending a position, or going into a dark alley, or charging into a burning building, you need courage. If you want to turn it around a little, courage is also the response which is needed by pacifists, by peacemakers, by people who face fearful situations, and who do not let themselves run away. I think that being a peacemaker demands an extra measure of courage sometimes, because I have laid down the possibility of my giving a violent response. Non-violence is a courageous way of life.
Courage is also what a patient needs, who knows that a treatment or a test is going to hurt.
There is every reason to be afraid. You know that needle is going to stick you. Part of the reason that you don't jump off the table, and go running down the hall and out the door, is that you'd be embarrassed if somebody saw you running around town dressed in a hospital gown. I hate hospital gowns. They seem designed to leave me feeling naked.