Yossarian.

Later in the book, Yossarian talks about being born into a state of innocence, and you also find out the Snowden is a young man, almost a child who is killed by the war in the first missions he flies with his air force outfit. He is the dead man in Yossarians tent. After one mission, Yossarian comes out of the plane "covered in snowden" or figuratively the blood and parts that made up the young man. A common theme discussed in war literature is how soldiers have their innocence robbed by the nature of their profession. Yossarian is trying to figure out what happened to the innocence of youth and how it is affected by war.

Catch-22.