I think I know this one.
The Fu-Go was a hydrogen ballon which Japan developed to drop bombs on the US using the jet stream to carry them to the US mainland.
i guess the unique bit was they were the only bombs dropped on North America in WW2?
A useless fact on top, they were the longest bombing raid in history until the Vulcan Raid at the beginning of the Falklands war.
Well it must have been the battle for Berlin surely?
Alaska - Anchorage
Hawaii - Honolulu
I'll have a think about the other two.
Those were the easy ones
C