One last rant to add to every excellent point every1 has already made, the options the USA has seem to boil down to this (very basically, because I don’t want to complicate things anymore at this point):
1). Go GF for the first 2-3 turns and then switch gears to JF. This has good uses and the resulting monstrous Japan is not the end of the world, because the upside is that either Russia will survive, or, if Germany takes it down, the allies will make monstrous gains in Western Europe;
2). Go JF for the first 3 turns max and then switch gears back to Europe. This looks as good (or bad ;-)) as the above GF proposal, but this time Germany will become monstrous instead of Japan;
3). Go 'K’JF. Same as point 2 above, but now continue against Japan for 3 more turns. Allies need to realize that either Moscow or Cairo will be lost to Germany and they will have to fight for control of the other, remaining VC. Looks very dangerous but do-able.
4). KGF is not an option, unless, to a somewhat limited extend, if the allies can see Japan focus a lot on Russia and the Med, after they took India.
With all the above strategies, the allies need a perfect tactical execution. Somethig many players fail a lot at, which causes so many allied losses these days. And if playing with dice, they need luck as well.