A conflict between humans of Earth and the Moon sometime during or shortly after "The End". There is little consensus as to what prompted hostilities, though one source has gone on record with a statement.
"Fucking Mooners bombed us, is why. They'd been talking about it; they used them giant moon guns on us. My grandpap said it's 'cuz living up there in space made 'em all go looney."
Malcolm S.
Evidence, thus-far, has suggested the so-called war between "post-boom" Earthlings and the Moonlings culminated into several minor skirmishes and blockades to trade, but there were no mass casualties.