I wouldn’t imagine building an mIC there ever worth it, but that’s just me.
Crockett36, just an FYI this is a Pacific 1940 thread, NOT a Global 1940 thread. So keep in mind your parts about defeating Germany are invalid in this particular situation :-)
To sort of piggy back off of crockett36’s post though, for those that apply to a Pacific 1940 game, you’ll definitely need to look at how the whole game plays out. By that I mean, you’ll probably need to be prepared to be semi-aggressive with ANZAC and UK both with an Alaska strategy. As Crockett36 points out, you’ll be throwing most of your force that way presumably, so that leaves Japan to (also presumably) focus efforts north as well. If that happens, you’d want to be ready to pounce as ANZAC and UK, wouldn’t you? Attack the Caroline Islands, fortify the Philippines and DEI, etc.?
That all said, the other tricky thing about this strategy is knowing you start out on the second foot to Japan. they get to go first, so will dictate play a lot. Also depends on when Japan attacks. They start out with an obviously significantly larger naval force than the US, and could potentially leave enough force to deal with Alaska, and also continue to strike south. If a J1 happens, I think an Alaska build up is rather difficult.
But, if it’s delayed to J3, with a US entrance to war on US4, then you may reasonably be able to have built up a decent size force to do this. Again, assuming you coordinated with ANZAC and UK as well. This might all be pointless to do if ANZAC has only built defensive ground forces, or UK gone all ground force to help China, etc. You’d essentially have an empty theater in the south where Japan isn’t getting hit in that case. Or, by staying defensive, might allow Japan to still do what needs to be done in the south pacific without jeopardizing it’s Alaska force much.