Just wanted to add something to the Japan discussion:
Opportunity Cost of replacing land units in China:
When there is a single Chinese infantry on your flank, sometimes its better to swing in with fighters and risk the 10 IPC loss of a fighter than it is to lose the infantry you use to attack with.
Here’s my reasoning: As you get deeper into mainland China, it becomes more difficult to replace lost ground units. If you win that first battle against China and have to trade an Inf and are only left with maybe an artillery and a Mech you run into a problem where China placing a single Infantry unit on your flank creates problems. Sometimes it is better to simply send extra aircraft or even JUST aircraft to remove that infantry from the map.
If not, you face the quandary of figuring out how to prevent China from replacing lost IPC you fight hard for in the South by simply moving a single Infantry into a territory on your flank and no units coming from the rear to stop that advance.
I’ve found that building a Minor helps alleviate this, but the risk of losing it by any Allied nation shooting in to cut your supplies and returning the territory to China (hence destroying the minor) is a dangerous proposal.
Alternatively, you can use transports that generally require an escort with an American Bomber on Hawaii, Midway or some of the other Islands with AB’s. That is generally going to mean you want at least a DD and a TT to resupply ground units to Mainland China costing you at least 15 IPC plus 2 ground units worth of IPC. I’d happily trade a Fighter than have to spend 21 or 22 IPC to stop a Chinese advance of even a single Inf on my flank and wait multiple turns to stop the bleeding. I’ve played people that will risk the US bomber anyways at the proposal of the DD missing and the US being able to sink 22 IPC worth of units and costing Japan more time before ground forces arrive to reinforce the mainland front.
With the minor, you can generally address this with fast moving Mech’s where you spend initially 12 IPC J1, 12 IPC J2 on 3 Mech and then on J3 can move them 2 spaces from the Minor provided you control the spaces next to it. Again, you are costing yourself at least 20 IPC and 3/4 turns before addressing it on J3/J4
So, the opportunity cost is:
1.) Deal with the problem immediately and maybe lose 10 IPC
2.) Spend 12 IPC 2 rounds in advance for a Minor, at least 8 IPC, potentially 12 IPC 1 round in advance and on the third round address the problem and probably STILL use aircraft to finish the job as Mechs still only attack @1.
3.) Spend 15 IPC on a DD and TT, plus 7 IPC (Inf/Art or Inf/Mech) for 22 IPC, Land a round later and on Round 3 you may be in position to address that Flanking move while potentially STILL using aircraft to make sure you don’t get diced.
Personally, I’d rather just cut the red tape and risk 10 IPC early with an asset I have many of (aircraft) to give me more flexibility in IPC spending on the naval threats that face Japan once she advances into the South Pacific.
Note I’m not saying that the purchase of a minor in China or FIC is a bad thing - generally its a requirement and a boon if the US moves into convoy SZ6 while your ships are in the DEI/India. I’m simply pointing out that I’d rather be able to send 3 Mech towards India than have to shoot them into the heart of China to deal with rogue infantry on my flanks or behind my line.