[Some people are called to medicine; others are called to the priesthood. Still others, like Casey Sheehan, are called to put on a uniform, pick up a gun, and defend their country in times of war.] There is joy, ... in fulfilling a calling that fits who we are and, like the pillar of cloud and fire, goes ahead of our lives to lead us... Our gifts and destiny do not lie expressly in our parents' wishes, our boss's plans, our peer group's pressures, our generation's prospects, or our society's demands. Rather, we each need to know our own unique design, which is God's design for us.