There was always talk of espirit de corps, of being gung ho, and that must have been a part of it. Better, tougher training, more marksmanship on the firing range, the instant obedience to orders seared into men in boot camp.
I have long had a tendency to tie marksmanship to morality. The essence of good marksmanship is self-control, and self-control is the essence of good citizenship. It is too easy to say that a good shot is automatically a good man, but it would be equally incorrect to ignore the connection.