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Ceratomia undulosa
Large moth, approximately two and a half inches long. Markings in grey and black. We laughed that it looked like Real Tree camo print.
Wow! Striking! This looks much like Ceratomia undulosa, but the markings are very heavy. Here is my reference link:
http://bugguide.net/node/view/3749
You might also want to submit this to BugGuide for an ID confirmation: http://bugguide.net/node/view/6/bgimage