The profession of arms involves the disciplined use of legally sanctioned force. It imposes many demands but imparts lasting rewards upon those who enter it. While the professional calling of the soldier is to support and defend the Constitution, the challenge is to learn the profession well enough to accomplish any mission effectively while protecting the force. The soldiers of the United States Army serve around the world in a multitude of different missions and roles. We are all volunteers. Although there are many reasons why each soldier joins the service, at some level one of them is the desire to serve our Nation.