The given passage reflects the meaning of military history since Bob Kiley’s behavior can be called immoral. A mine accidentally blew his friend up, about which the hero writes a letter to his sister but does not receive an answer. Military history is never moral since an accident can be a complete lie, and things that have not happened are more than true. In his story, O’Brien does not support the moral standards of the characters’ behavior and does not keep people from doing what they have always done.
The letter to the deceased sister reflects Bob Kiley’s complete lack of morality. In this message, he tells too many details, which are a representation of tactlessness. For example, the story of the men at the listening post or another tale about how they raise hell and light up villes and bring smoke to bear every which way. This example is immoral since it is unpleasant for a girl to know such details about a loved one. The war is serious concern, while the Rat makes it a joke.
In general, the story should be understood as irony since the characters are in different conditions and, one might say, live in other worlds. Kylie is still too young, and she does not understand the seriousness of what is happening because of this. Like a little boy, he is offended by the fact that his sister does not answer his heartfelt message for more than two months. The situation looks completely different from her sister’s side since the heroine has never faced such horrors. War is a complex event from which there is no single right way out; therefore, it forces people to find themselves in extreme situations.