I had been a fan of efficient US effort towards Europe, as detailed in Caspian_Sub Policy Paper #2
US1 (42 IPC): build in EUS 3tra, 6inf (or even 3tra, 2inf, 3arty)
US2 (40 IPC): build in EUS 1tra, 4inf, 4tnk
US3 (38 IPC): build in EUS 1tra, 4inf, 2arty, 2tnk
Planes fly to Europe as well.
And even more, getting to 5+5 transports to Europe (35 IPC = 5 inf + 5 arty), once even 6+6 (adding some IPC in Europe). Building US planes instead of inf+arty and a little tanks is less effective.
But I found all this the most vulnerable to Japanese “coastal guerilla” as described above. Alaska may be only a staging point, but if US gets negligent then Japan may continue building a serious base (ftr’s landed in Alaska, further landing a ‘screen’ in WCA). All without committing really strong forces.
I find the US to be extremely annoying to play when Germany starts off with a 2 tran or car build, then you as the US have to build some assault navy to take it out, then Japan lands in Alaska. Your shuck is quite possibly ruined for 1-2 extra turns.