Write more of these essays SNDess, please. I enjoyed this one a lot. I haven't ever read "Catch-22"; I certainly will now, due to your essay.
I like the way you make the whole flow from one idea into another. While I haven't, as I said, read the book, I think that your explanation of why Heller chose to use the comic mode is quite insightful - I can see your point about why he would have made that choice quite clearly. I saw the same thing in the book, film, and television series, "MASH". That approach worked quite well there. I can also see why an episodic telling of the story would work as an imitation of how life in a war unfolds. Certainly, the stories my father told of his experiences as a radio operator on a bomber in World War II and as a "guest" of the Nazis (as a prisoner of war) after his plane was shot down over Italy, support many of the ideas you express in your analysis of "Catch-22".
I did see a couple of technical problems with your essay, but they were few and very minor, and I will not comment on that aspect of your writing unless you specifically ask for that. Just write more, and these little technical problems will eventually work themselves out. (Just so you don't worry that I've made this comment, I'll tell you that of the most glaring problems that jumped out at me, two were probably an artifact of paying attention to spell and grammar check [which you shouldn't always trust] and the other was a dropped word that very well could have been a typographical error. All three occurred in the first paragraph of the essay).
All in all, however, a very good essay.