I’m not sure what type of scenerio we are up to (meaning what went on on the previous turns), but it should be extremely costly for Japan to even attempt a strafe. Not that they won’t do it, but that they lose a lot of high powered units in the effort.
I agree with Jen that you don’t need large amount of trns but I would also say I like more than 1 for my initial thrust or the turn right after that.
I like that because as Switch points out you can get stranded if Japan does have the numbers to attack/strafe. Plus, I think it is unrealistict to move 5 inf/5 arm to Sol and expect Japan to leave Tokyo open and you don’t need 5/5 to take the other islands. You only need 2 inf as long as you have ftrs and a BB.
For me, once I move to Sol, my follow-up builds will always contain a trn, so should Japan attack/strafe I have a trn ready to pick up the 2 inf the following turn. At most I risk stranding 2 inf (6 ipc) for one turn instead of 40 ipc worth of units. Japan will also not be able to continually get to strafe off the one trn, they’ll get one shot (maybe 2) and that is about it.
This is why I like the AC/ftr method. With only 1 trn, 1 dd, 1 bb, 3 acs, 6 ftrs (not hard to get as the US), Japan is already looking at taking ~7 hits just to strafe off one lousy trn. I’m not sure if Japan is spending the first 2-3 turns buying subs to absorb the hits which means they are either using trns or ftrs and both are good for the Allies.
Now this is strickly dependent on the game but If the US can move with 1-2 subs as additional fodder and get the 4th AC with 2 ftrs, Japan again is looking at taking massive losses just to kill one trn.
Typically the US can take the losses much more easily than Japan. (cheaper to defend then attack) Use those ACs and ftrs as 3’s and 4’s.
This is why I like the Sz 30 unification by the UK. Japan just lost 3-4 ftrs (possibly a capital ship) if they chose to attack and now if the US does indeed drop an AC (or 2) or BB (or both) in Sz 55 on US 1, it can be a real pain in the neck to even come close to trying to prevent a move to the Sol on say US 3, where the US can already have 3 acs and 6 ftrs plus the DD and BB for defense.
And this would of course depend on Germany and if they bought an AC/ships and can threaten a pretty good unification move to the Atlantic since the US forces may be needed to help prevent that.