"Friends ask if I worry about going from a life of independent thought and action to a life of hierarchy and teamwork. At the moment, I find that appealing because it means being part of something bigger than I am. As for how different it's going to be, that, too, has its appeal because it's the opposite of what I've been doing up to now. Why should I do something that's a "natural fit" with what I already do? Why shouldn't I try to expand myself? In a way, I see the Marines as a microcosm of America at its...