US gets the bonus in the first collect income phase after it has become at war with any of the Axis powers. And also, it gets the bonus in all subsequent turns. The 10–>50 IPC United States West only applies to the Pacific standalone game.
Slashing the deck UK/US bombing campaign
A scrambled plane cannot hit sub without a DD.
Yeah my mistake. I was thinking the plane could hit the sub, but it can’t w/o a def destroyer.