77stranger77 already covered much of what I’ll say, but I want to go into a little more detail on the transport logistics. Before I do, though, I will re-echo the point that going after Japan is in general much harder than going after Germany–I would only send the US Navy after Japan if there were specific game circumstances that opened up that possibility (i.e. Japan gets really screwed by dice, or makes some really bad decisions). Also, if you do KGF well then you don’t actually need to worry too hard about stopping Japan. You can slow them initially with the UK (as in 77’s recommendations), but by the time they are a serious threat to the Russians you should already be pushing Germany back and also have Allied troops available to reinforce Russia where needed. Also, remember that if Berlin and Moscow both fall then it is almost always an Allied victory, so as long as you kill Germany you can afford to lose Moscow–though you’d rather not, of course!
The USA is the country whose strategy is most heavily about logistics, because of the need to cross the wide ocean. Technically, there is one place on the map where you can still cross the Atlantic in one move–SZ 9 to SZ 12–so you can still do an old-school AA Classic shuck into Africa. I actually lost a game once to a guy who did just that…shucked troops into Algeria, then had them trudge all the way across Africa to Trans-Jordan and then into Caucasus to join the action. He got some help from the dice, though. I wouldn’t recommend that approach as it’s far too inflexible and the supply lines are just ridiculously long.
What that means is that you’ll need two transport fleets and two shucks. The basic (and best, IMHO) method is to shuck troops into UK using a fleet that bounces between SZ 8 and 9 (or 8 and 1, or 2 and 1–some flexibility there), and then do a second shuck into Europe, either Norway via SZ 6, or Karelia/Eastern Europe via SZ 5, or Karelia and Archangel via SZ 4. The second fleet will generally follow the UK around so that you don’t have to buy a second set of fleet defense to protect from the German air. You can either set up a 4x4 shuck (meaning 4 transports in each fleet), which can move 8 ground units per turn, or a 5x5 to move 10 ground troops. I usually go with a 4x4 so that I can get more air, but 5x5 is quite strong and I’m thinking about switching to it.
For a 4x4 shuck the soonest you can get the whole system up and running–meaning you’ve reached the “steady state” situation where all the pipelines are in place and you’re just turning the crank each turn–is turn 5. That’s assuming you don’t buy any ships other than transports and that you don’t divert more than a couple troops to the west coast to ward off potential Japanese invasions, so in actuality it may be turn 6. You will be landing some partial loads before that, but it will take that long for the US to hit its stride.
A lot of the US logistics is about how much of your money to spend on transports and how much to spend on ground troops. If you buy all your transports up front then it will take a while to get any ground troops moving at all. On the other hand, if you get too many ground troops too soon then you won’t have transports to carry them. I did the math once and the solution I came up with is a 2/1/1/1 transport buy–meaning you buy 2 transports on turn 1, and 1 transport on each of the next 3 turns, and spend the rest on ground troops each time. (This is assuming you send the transport from SZ 55 to the east so that it shows up on turn 2 as if it were a free build.) This way your ground troops will keep pace with the transport chain as the latter is being established, so that you can land some partial loads while you’re getting the infrastructure in place. You may have to deviate from this for specific game circumstances, but the basic rule to keep in mind is that if you’re buying a transport on turn X, you need to start buying ground troops for that transport on turn X-1. If you only start buying the ground troops on turn X then after it shucks to SZ 8 on turn X+1 there won’t be anybody in Canada for it to pick up on turn X+2.
There is an alternative US strategy that focuses on the Mediterranean instead of following the UK around the north. This has some advantages: It allows you to directly funnel troops into Caucasus, which is in many ways the most critical territory on the map; it puts more territories into play (specifically Seu and Blk), which raises your paycheck and drains Germany’s troops as they have to trade more; it often forces Germany to abandon France in order to stack Italy, or to trade Italy heavy and thus drain their troops that way; etc. On the other hand, it requires USA to purchase more fleet defense, at least one carrier and possibly more, since you have to defend at least 2 and sometimes 3 fleets without UK help, and it doesn’t allow you to triple-stack Eastern Europe. (In the first strategy, the critical turning point is when the Allies can all team up to stack Eastern Europe with a stack that Germany is unable to kill. After this point Germany loses the income for all the territories east of that, and things quickly spiral downhill from there.) It becomes harder to actually advance on Berlin since the Allies aren’t working as closely in concert. For these reasons I recommend the first strategy (following the UK around), especially if you’re relatively new to Revised.
A word about France: Generally the way to crack France is with a two-wave assault, with the UK attack weakening it and the American attack capturing it. This may require the UK to sacrifice a couple planes, but you generally kill some defending German planes so that it balances out. Once the fleets are in place the UK and US will both be threatening France with 8 ground troops (more if you overbuild transports, which the UK should definitely do by one or two–but that’s another post) plus a battleship plus several planes. In order to withstand that the Germans will need something like 15 inf plus several fighters on defense. If they put that much in France, don’t attack it; just consider your mission accomplished. A stack that heavy in France should enable the Allies to take control of the eastern front, after which you can reinforce Russia as needed and start to press against Berlin from the east.
There is a Caspian Sub policy paper that covers a lot of these concepts about Allied shipping options. Unfortunately Caspian Sub is no longer active, but I’d be happy to email the paper to you (or anyone else reading the forum); just send me a PM. (For those who don’t know, Caspian Sub was a Yahoo group devoted to A&A Revised strategy; in addition to the email discussions, they published a number of “policy papers” with in-depth analysis of various topics.)