Well, the best way for Japan to get troops on the ground in South East Asia is minor factories. Japan can get units into Northern China from SZ6 from Japan. Every turn then can dump X troops (MAX 10 troops) from Japan into Manchuria for free as long as you have the TRS lift capacity.
The USA on the other hand really has no choice but to use TRS to move troops across the globe, thus it requires a plan.
Here are the 3 most common plans the USA comes up with.
#1 The GHG Southern France TRS shuck plan of attack.
Floating Bridge Plan of Attack
So, this is how that one works. USA has 5 TRS on East Coast USA, 5 TRS in SZ91 and 5 TRS in SZ93 off the coast of France. You can then “Shuck” 5 Inf + 5 “other units” every single turn into S. France. It is the only place on the map the USA can do this particular plan of attack.
So SZ101 moves 10 Troops to SZ91 and drops off. Next turn you build 10 units in Eastern USA. Following turn you move the 10 troops from Gibraltar from SZ93 to Southern France and the next 10 units move from SZ101 to SZ91…Rinse and repeat forever. Always bringing 10 units every turn into Europe.
It is very effective and also gives you some flex if you so desire to pivot from SZ91 to Oslo or Rome. SZ91 is the most powerful SZ in the game, USE IT.
#2 the Norway option
So we have 3 TRS in E. USA, 3TRS in Iceland to shuck back and forth. Now we have 3 TRS in Iceland and 3 TRS in SZ125 off the coast of Norway. So it is a 12 TRS “shuck” to move 3 INF + 3 other units. It requires 2 turns to prime this shuck. Now the nice thing is once you take Norway you can put a minor on it, keep shucking 6 units + the 3 build units from the minor.
IMO the downfall of the Norway plan of attack is that it is not a direct attack on Germany and in essence they can ignore it for a few turns and focus on beefing up Russia in the north to contain it.
NOTE: You can go to SZ91 instead of Iceland but it does require you to build a port in Norway to perform this “shuck” and a delay of one turn to build the port.
#3 the Spanish Beach Head
The easiest way to get troops on the ground in W. Europe but is does break the neutrals. � Real simple, 5 TRS in SZ91 and 5TRS in SZ 101, shuck 10 units into Spain every turn + the minor factory you can build in Spain.
This is actually more powerful than the GHG option #1 and it includes the UK into the plan. The UK can shuck from SZ109 to SZ104 every turn and drop up to 10 units a turn from London onto Spain on a single move shuck.
So, in theory the USA + UK could drop 30 INF in one turn on Spain. 10 INF from E.USA, 10 INF from C.USA and 10 INF from England. And do that every turn if the Axis cannot retake Spain, plus the three units USA builds on the Factory.
When it comes to the Pacific the plans of attack are based on the same principals.
W. USA to Hawaii, Hawaii to Caroline or Queensland. Queensland/Caroline to Philippines. So it is a 3 leg shuck. So lets plan on 3 TRS shucking 6 units a turn. You would need 18 TRS to fill the shuck supply line.