• Extremely powerful combat bonuses
  
• Focuses on mobile divisions, especially tanks
  
• Great on the offensive, the worst doctrine when losing
  
• Thrives in places it can utilize it's mobility(central Europe), but suffers in places with bad terrain, low supply and unforgiving weather(Russia, Africa,..).
  
• Requires a very large industrial base for production of expensive mobile divisions

- Always pick Mobile Infantry over Blitzkrieg
- Pick Modern Blitzkrieg, but if you are out of manpower pick Desperate Defense

• Good general combat bonuses
  
• Great at preserving manpower
  
• Focuses on an Infantry/Artillery heavy unit composition
  
• Balanced between offense and defense, with a slight preference for defense
  
• Requires a large industrial base for production of costly infantry divisions

- Dispersed Support and Integrated Support and quite Similar. Dispersed Support gives buffs to you art divisions, but Integrated Support gives buffs to support companies.
- Use Airland Battle if you will fight against tanks and use Sock & Awe if you will fight against infantry

• Jack of all trades, master of none
  
• Great at stale fronts, utilizing it's high entrenchment and planning bonuses
  
• Balanced between offensive and defensive abilities
  
• Emphasis on Inf, Mot and Mec - provides the most powerful offensive Infantry bonuses
  
• Requires no special industrial base

- Assault offers some small extra bonuses to armed and mot/mec, and doubles the max planning bonus from 30% to 60%, while Infiltration mainly gives -10% supply consumption and +25% night attack.I would rather pick Infiltration

• Poor general combat bonuses
  
• Very powerful other defensive bonuses, to supplies, manpower, partisan effects on enemy etc.
  
• Heavily focused on cheap Infantry
  
• Very defensive
  
• Great in difficult terrain, weather, and low supply areas

- Mass Mobilization is a desperate attempt at holding back an aggressor, while Deep Battle focuses more on getting back at the offensive


xxxxxx - I marked with this font what i would pick and what i recommend.

Specific Doctrines for specific Countries(debatable)

By bombing the enemies factories, either by night, or more dangerously, during the day we can seriously hinder their war machine.
- Research this doctrine if you will be using strategic bombers.
By improving how close air support interacts with divisions we can lay waste to enemy divisions with optimal support.
- Research this doctrine if you will be using fighters / cas.
Tactical bombers are flexible and can perform both ground support and regular bombing.
- Research this doctrine if you will be using tactical bombers.

This is the well-rounded general purpose set of naval doctrines that most substantial navies used. It enhances Search & Destroy for capital ships, submarine detection for screening ships, and bonuses for all classes, although subs seem least favored. This is the most powerful doctrine for surface action. It is the most efficient in responding to the escort needs of convoys and in anti-submarine warfare.
This is an offensive doctrine focusing on attacking enemy convoys with coordinated stealthy surface and submarine raiders that have superior abilities to find and destroy enemy shipping while evading enemy detection. Such stealthiness can also be valuable in normal combat or escaping from it, which is usually the best course. Submarines are made very dangerous to the enemy. The trade-off under this doctrine is that light cruisers and destroyers have mediocre anti-submarine warfare capabilities and weak escort efficiency bonuses, so vulnerable friendly shipping may require more effort to defend. Germany adopted the raiding strategy in its efforts in both world wars to strangle Great Britain by cutting off its shipping, but this can also be suitable for minors seeking a naval presence to strike enemy trade with moderate risk and expense.
This is similar to the approach of Japan and the United States. It focuses on blue water navy carriers and their light cruiser and destroyer screens, with submarines also receiving decent bonuses for supporting carrier operations. There are no class-specific bonuses at all for battleships, battlecruisers or heavy cruisers, but if built they share the array of global bonuses under this doctrine. Having at least a few fast heavy cruisers that can keep pace with the carriers for bombardment and surface action is advisable, but it is possible to focus just on research and production of carriers, screens and carrier aircraft to make the best use of limited resources.

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