'Catch-22' Week 4, The End: Discuss!

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Well, here we are. Catch-22: we took off on our collective bombing run, did our best, and now here we are back on the ground, having lost some good friends along the way. But we're alive. Isn't that what matters? Survival? Yossarian seems to think so. (I'll get to that in a moment.) Now that you've seen how everything ends up, what do you think about Heller's take on war, camaraderie, survival, heroism, or any other themes? Is Catch-22 a novel that caught you by the end, or did it leave you cold?