Alright, after hearing some of your problems over IRC, I'm going to pt my own opinion here, along with pointing out various stupid mistakes you guys make.
First off: Commerce Raider. We want subs for these as anything else will be to noticable. And the minute they see something coming for them, the alert is going to be raised. Stealth is the foremost and the most important aspect of convoy raiding.
Next part is the navy in general. Destroyers should be primarily Anti-sub and Anti-air, they primarily exist to serve as an escort ship in flotillas for any larger ships built, such as carriers and battleships. The lightest ship class that should be based upon ship-to-ship combat should be light cruisers, and if we want anti-ship capabilities upon the destroyers, we outfit them with torpedoes. The subs themselves should be primarily outfitted with torpedoes as their sole weapon since we've screwed up if they have to surface to fire.
Thirdly, we better start upgunning our tanks for AT warfare, mainly via upgunning, uparmouring and outpacing every other tank design out there. As it is, the badger is likely to be outpaced within the space of a year or two and as such a new tank should be designed to maintain our lead within that particular section of the arms race. This means abandoning gasoline for military vehicle fuel altogether in favour of diesel (The disadvantages of such should not come up barring conflict in an arctic, tundra or taiga region), along with the introduction of a christie suspension system for the tanks. This will give us fast, mobile tanks capable of striking very hard at the enemy regardless of the terrain.
The self-propelled guns do not need as much armour UNLESS they're an assault gun. If they're getting shot than we've screwed up very badly. We can afford to drop the armour around the gun compartment for those, or even just forgo a turret entirely (Save for the SP AA)
Infantry-wise, we should look into carbines and flamethrowers, as these will provide decent weapons for combat within urban terrain.
Lastly however: DO NOT, UNDER ANY CIRCUMSTANCES ATTACK A NEUTRAL CONTRY. We DO NOT need the international condemnation, or the Morovians gaining an ally. If this happens we WILL lose the resulting war. We also need to keep that line open. Any defensive war upon our shores, we will win decisively, along with most ground wars. But the minute we bring the other neighbor into conflict with us we're done for.