Every efficient officer must realize the possibilities and limitations
of his own arm of the service as well as the possibilities and
limitations of the other arms. Each arm of the service is necessary and
important. A proper understanding of the use of the combined arms is as
essential to success in battle as cooeperation between the different
members of a football team is to its success. Don't knock any arm but
the one you are in, and don't knock that unless you are willing to admit
you are not man enough to improve it.