In what ways does A Farewell to Arms reveal the Hemingway code of behavior for a man?

Frederic Henry is detached and analytical and his observations to the reader are delivered in simple terms and without recourse to artifice. The impression is of a young man existentially removed from the world. As a typical Hemingway hero he enjoys drinking, rarely if ever displays weakness and acts without hesitation. The only time in the story that he fires his weapon, for instance, it when he shoots a defecting Italian soldier. The moment is delivered, however, with the same dispassionate tone as when he describes the quality of a drink or the lay of the land. By the end of the story Frederic has come to accept the Hemingway outlook that death comes to everyone and one may as well accept it and act accordingly.