There are other options.
Map.
Chapter IV: Basic Strategy and Military Organization
*(^^^) One wants Wake Island to split the Japanese defense and get into the Gilberts a half year earlier.
That is Balmey 2.
Comments:
a. It is absolutely vital that the Americans learn about an integrated air defense system (Radar based ground controlled intercept); since there is no way the Japanese are ready to try anything before December 1941. They do not have their Indo-China buildup ready for Singapore, they need more aircraft production, CARDIV 5 is not ready. Neither are the special bombs or torpedoes ready, nor are the landing craft, nor are the Special Naval Landing Forces. That is six months of European War to figure out American air defense. See F.
A 6 month "gift" courtesy of that idiot U-boat captain means
a much tougher war for Japan.
b. If air defense is the blessing for Pearl Harbor, then what about LANTFLT? The ASW swap will be useful earlier, because Drumbeat comes before Doenitz is really ready. He was not ready before in the RTL, but his planning staff now has six months less to figure some things out; for they do not the luxury of what-ifisms. They are also royally screwed in the middle of their Mediterranean U-boat deployment. And... Anything that gets Stark fired six months earlier is an added bonus for the USN.
c. The Lee/Grant is not ready. It does not see first model off the floor until August. The US is at war 1 July 1941. What can it get to North Africa right now to help the British hurt the Germans in America's name? Christie is sitting on his butt, but he knows how to build "Christie tanks". The Crusader is almost 80% American as is. Build it. Lees were built six months after mockup. How long to mockup an American version of the Crusader with British engineering drawings in hand? Six months I estimate. American built Crusaders will be better than British built Crusaders because US QC is frankly far superior. And as I wrote, the skip to Sherman will be quicker as the operational experience is gained. And... expect to see US divisions headed to Egypt by January of 1942. They will need tanks.
d. Aero engines. How much range did the Allison engined B-17 (XB-39) gain over its Curtiss Wright junk engined equivalent?
d sub a. 2,000 miles with 6,000 pounds of bombs= tactical radius of 650 miles.
d sub b. 3,300 miles with 6,000 pounds of bombs= tactical radius of 1,100 miles.
WHAT is wrong with that picture?
Put in a Bristol Hercules and see what happens. I split the baby at about 850 miles. That begins to look like Lancaster Performance and it means Uncle can have a Pacific bomber 2 years early.
Napier Saber weighs less than a Wright Duplex Cyclone and it does not have a history of catching fire and EXPLODING in flight. Guess what happened to the Douglas BTD? The airframe was fine, but a certain crap engine was problematic. The Napier Saber is ready right now not after a year of teething troubles.
Guess what other beast can use the Saber?
The Avenger as in right now say in time for pilot familiarization and use before Midway?.
e. Sangamons. Stretched ones. Six months head start helps. Even slow CVL-AOs means things brighten up in the 2 Ocean War.
Cause a Sangamon not only operates planes, she can refuel a fleet.
f. Since the USS Wasp will be making Malta runs earlier, she can cross train with HMS Furious and that might mean LANTFLT gets 4 channel and passes it on to PACFLT in time for Coral Sea. It also means that PACFLT could carry it into WATCHTOWER.
Late 1941. The First Lee did not get to the North Africa Front until after Crusader. The American tank present was the M3 Stuart (about 165 of them in that battle.). British trouble with the Crusader and her 57 mm gun was doctrine, not the tank. The thing could have fired HE. The British just decided that slugs were the way to go since the tank was supposed to kill tanks. They relied on Arty to nix AT guns and infantry when their tanks charged. I am sure that when Patton showed up, that would have changed.