At the same time, and as the message itself implies, specialization, like sex and the automobile, is here to stay. In the service, perforce, even the balanced, all-around man has his specialty. In the beginning, true enough, he may aspire only to being a soldier, marine, sailor or airman. That is good enough in the cocoon stage. But ultimately he emerges with the definite coloring of a ground fighter, a gunner, an engineer officer, a signals man, a submariner, a weapons man, a navigator, an observer, a transport officer or something else. If his tact, bearing and quick pick-up suggest to his superiors that he may be good staff material, and he takes that route, there are again branch lines, leading out in roughly parallel directions, and embracing activities in the fields of personnel, intelligence, operations, supply and military government. And each one of these main stems has smaller branches, greatly diversified. The man with a love for logistics (and few have it) might some day find himself running railroads or managing a port. The engineer could become a salvage officer working a crew of deep sea divers, or as easily a demolitions expert running a company of dynamiters. The expert in communications? His next task might be setting up a radio station near the North Pole or helping perfect radio control of troops over a 50-mile area. It is in these things that the privilege of free choice arises, for despite the popular theory that in the services you take what you are given and like it, the placement of officers according to their main aptitudes and desires is a controlling principle of personnel policy. It is recognized throughout the military establishment that, in general, men will do their best service in that field where they think their natural talents are being most usefully employed. Among the combat line commanders in World War II there were doctors, dentists and even a few ministers. They could have had places in their regular corps, but they were permitted to continue with the duty of their own choice. Concerning the main problem of the officer, in fitting himself for higher command, the controlling principle is well expressed in the words of a distinguished educator, Wallace B. Donham: "The hope of the wisdom essential to the general direction of men's affairs lies not so much in wealth of specialized knowledge as in the habits and skills required to handle problems involving very diverse viewpoints which must be related to new concrete situations. Wisdom is based on broad understanding in perspective. It is common sense on a large canvas. It is never the product of scientific, technological, or other specializations, though men so trained may, of course, acquire it."