So the official rules for alpha +3 take out the 30 IPC bonus? so just original income + NOs?
Yes, but in general, the US will still get at least 20 IPCs from their national objectives, unless the Japanese make specific efforts to cripple the US income.
Forgive me if it's been stated but I wanted some quick clarification. Are the Alpha 3 rules supposed to supplement what's been stated in Alpha 2 or are they their own rule set? In other words, should I be referencing both Alpha 2 AND 3 when playing? I know Krieg mentioned that these are for global, but I really prefer Alpha 3's rules over the OOB. Thank you.
EDIT: I also noticed that the US no longer has the NO of +30 IPCs in wartime. Is this a mistake?
Alpha 3 is its own complete set of rules. You only need to reference Alpha 3 when playing. However, the core mechanics of the game like attacking and defending and unit statistics are the same as they are in the original rule book. Alpha 3 just modifies some rules and setups.