The spring reinforcements.
The commonwealth is building very defensively from the start of the game ; that's a common pattern for me. This includes a steady amount of convoys, many planes, mostly Navs and Fighters, and some factories and synth oil. The starting navy is usually good enough, and it can be augmented with all there is in the construction and repair pools. Put in the occasional land unit for garrison (Gilbraltar, Egypt, some at home.)
Germany has to produce an extremely well balanced mix of units. Unlike the Commonwealth, it cannot afford to forget any area considering the chosen strategy (go west), and the long term threat (Russia, which will be coming sooner or later.) This can only work if the units that are built now will later prevent a landing in Europe. Actually, I am dubious : I feel that going west will leave Germany too vulnerable when the bear strikes.
China and Russia are paranoid: Infantry and, for Russia, any land unit. Throw in possibly a plane sometime (I did not this time and the air force is obsolescent.)
Japan also has a hard balance to strike: it must prosecute correctly the land battle against China, so its main production is land units (mostly militias and territorials for losses), and the occasional long term naval units (carriers.) There will be time later to augment the air force. Anyway, the choices are rather difficult there.
The USA take their time, build long term units and special ones, which may be used for good effect from the start of their war: carriers, battleships, HQs, marines, paras... Their air force is obscolescent too... But why risk building old units that might get scrapped the following year ?
At this time, the Commonwealth has 5 fighters, 3 navs and 2 bombers.
It faces 6 german fighters, usually one notch better, 2 navs and thre bombers.
This is a standoff: for Germnay, going and bombarding on Great Britain without fighter cover (German fighters cannot follow) is certain death for the bombers. But the reverse is true... So the planes face each other with rare sorties... The attempt on Liverpool showed how dangerous a bomber raid could be.
