@noneshallpass Changing one restriction raises a few other questions. Just to be clear:
I refer you to my first paragraph. The list of income-determined actions are the ONLY things you can do.
Now all US ships must end movement near US land zones, not only in the Pacific?
That was always the case. The only exception was and is to enforce the Monroe Doctrine, which is stated in that rule.
Escort duty is allowed at 35 IPP, but rule 9.11 specifies « surface warships ». So the US can’t take naval transports along, right?
Naval Transports don’t do escort duty.
Can the US move its naval transports along with its warships for naval combat within 2 sea zones of US est coast at 50 IPP ?
Naval transports don’t participate in combat and can’t be used as cannon fodder so obviously not. Again, the list is the ONLY things you are allowed to do. Think about how long that list (and rule book) would be if it listed all of things you can’t do.
Can this 50 IPP move be done only during combat move, if there are actual German or Italian ships to engage, or also as a preventive measure during non-combat?
It says “May engage in combat”. That’s what the US is allowed to do at 50 IPP. Preventative measures does not qualify as combat.