Fear is a universal experience. I will face what is coming. I will not run away from it. I will take my stand, and I will not let myself by moved. The 23rd Psalm is not about courage.
Courage is the attitude, or the response, or the virtue, which is usually connected with soldiers.
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.