步兵科技

钢铁雄心 IV

陆战

集团军

陆军师

作战计划

陆军战斗

步兵科技

支援科技

装甲车辆科技

火炮科技

陆军学说

步兵科技科研树解锁了新的步兵装备，机动装备和机械化装备，以及解锁和改进特种部队，并改善了步兵和骑兵的整体战斗力。

步兵科技科研树

武器和装备

步兵武器

步兵装备代表步兵的标准武器套件，是任何部队的基础。每个国家都可以使用1918年的基本步兵装备，而所有主要国家和非主要国家都已完成1936年武器的研究。共有四种越来越先进的步兵装备。

Icon (generic)	Technology	Year	Base cost	Prerequisites	Description	Statistics
	Basic Infantry equipment	1918	Auto. unlocked		Basic infantryman equipment developed before and during the Great War.	2 Defense: 20.0 Breakthrough: 2.0 Soft attack: 3.0 Hard attack: 0.5 Max Speed: 4.0 km/h Piercing: 1.0 Reliability: 90.0% Production Cost: 0.43 Unlocks Infantry Manpower: 1000 Training time: 90 Recovery Rate: 0.30 Supply use: 0.07 Suppression: 1.5 Organization: 60 HP: 25.0 Weight: 0.5
	Infantry Equipment I	1936	127 days	Basic Infantry equipment	Personal and crew served weapons for infantry as well as the various other bits of kit a soldier needs.	2 Defense: 22.0 Breakthrough: 3.0 Soft attack: 6.0 Hard attack: 1.0 Max Speed: 4.0 km/h Piercing: 4.0 Reliability: 90.0% Production Cost: 0.5
	Improved Infantry Equipment I	1938	127 days	Infantry Equipment I	Personal and crew served weapons for infantry as well as the various other bits of kit a soldier needs. Improved weapon models and more specialized equipment.	Upgrades Soft attack: +5% Soft attack: +5%
	Infantry Equipment II	1939	170 days	Improved Infantry Equipment I	Personal and crew served weapons for infantry as well as the various other bits of kit a soldier needs. Modernized to include a great number of sub-machineguns and anti-tank rifles.	3 Defense: 28.0 Breakthrough: 4.0 Soft attack: 9.0 Hard attack: 1.5 Max Speed: 4.0 km/h Piercing: 5.0 Reliability: 90.0% Production Cost: 0.58
	Improved Infantry Equipment II	1940	170 days	Infantry Equipment II	Personal and crew served weapons for infantry as well as the various other bits of kit a soldier needs. Improved weapon models and more specialized equipment.	Upgrades Soft attack: +5% Soft attack: +5%
	Infantry Anti-Tank I	1942	127 days	Infantry Equipment II	Arming our infantry with anti-tank rifles will allow them to take out lighter armored vehicles while maintaining mobility.	Upgrades Hard attack: +25% Piercing +100%
	Infantry Anti-Tank II	1943	127 days	Infantry Anti-Tank I	For infantry to effectively engage heavier armored units, high-explosive anti-tank weapons need to be made smaller and lighter.	Upgrades Hard attack: +25% Piercing +100%
	Infantry Equipment III	1942	170 days	Improved Infantry Equipment II	Personal and crew served weapons for infantry as well as the various other bits of kit a soldier needs. Further modernized to include personal Assault Rifles and anti-tank rockets.	4 Defense: 34.0 Breakthrough: 5.0 Soft attack: 12.0 Hard attack: 2.0 Max Speed: 4.0 km/h Piercing: 10.0 Reliability: 80.0% Production Cost: 0.69
	Improved Infantry Equipment III	1944	127 days	Infantry Equipment III	Personal and crew served weapons for infantry as well as the various other bits of kit a soldier needs. Further Modernized to include personal Assault Rifles and anti-tank rockets. Improved availability of weapons previously distributed to a limited extent.	Upgrades Soft attack: +10% Soft attack: +5%

Support weapons

Support weapons includes crew-served weapons such as medium and heavy machine guns and mortars. These technologies provide bonuses to the defense and breakthrough of cavalry and all types of infantry.

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Icon (generic)	Technology	Year	Base cost	Prerequisites	Description	Statistics
	Support Weapons I	1918	127 days		Automatic weapons are becoming more portable. Submachine guns have already proven effective and the development of hand-held support weapons must continue.	Upgrades Defense: +5% Breakthrough: +5% Defense: +2% Breakthrough: +2% Defense: +3% Breakthrough: +3%
	Support Weapons II	1938	127 days	Support Weapons I	The development of automatic weapons which combine the aspects of light and heavy machine guns allows versatility in how our infantry employ their equipment.	Upgrades Defense: +5% Breakthrough: +5% Defense: +2% Breakthrough: +2% Defense: +3% Breakthrough: +3%
	Support Weapons III	1940	127 days	Support Weapons II	While maintaining and improving reliability of machine guns, we can also experiment with higher firing rates to ensure lethality of the constant stream of bullets.	Upgrades Defense: +5% Breakthrough: +5% Defense: +2% Breakthrough: +2% Defense: +3% Breakthrough: +3%
	Support Weapons IV	1942	127 days	Support Weapons III	With the increased use of assault rifles, developing automatic weapons that can be used in any environment by all soldiers is a priority for a modern army.	Upgrades Defense: +5% Breakthrough: +5% Defense: +2% Breakthrough: +2% Defense: +3% Breakthrough: +3%

Night vision

Night vision equipment allows soldiers to see even in the dark, offsetting some of the -50% penalty that units receive when fighting at night and giving an edge over enemies who do not have such equipment.

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Icon (generic)	Technology	Year	Base cost	Prerequisites	Description	Statistics
	Night Vision I	1943	212 days		Being able to see the enemy without being seen is key to night operations. With the invention of infra-red technology, we can outfit our army with devices which, though unwieldy, make this possible.	Global stats Land Night Attack: +10%
	Night Vision II	1946	170 days		Early infra-red scopes, although initially intended for use by snipers, had a limited vision range. As both the portability and vision improves, these devices can be used by more troops operating at night.	Global stats Land Night Attack: +15%

Motorized

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Motorized infantry is a somewhat harder and much faster version of infantry, but is more expensive and less reliable. It represents infantry outfitted with "soft-skinned—unarmored or lightly armored—vehicles (Jeeps, trucks, etc.). It provides infantry with more strategic (deploying to the area of operations, though state infrastructure is the primary strategic mover) and operational (moving along the front line) mobility and is suitable to accompany armored forces.

Motorized technology enables research of Mechanized Infantry that uses increasingly advanced armored personnel carriers and infantry fighting vehicles (e.g., armored cars and half-tracks). These are much more expensive than Motorized, and initially slower, but provide higher attack, armor and hardness, with much greater tactical mobility (moving under fire, i.e., the "breakthrough" stat). Mechanized Infantry should be upgraded to keep pace with the faster advanced tanks. Mechanized Infantry lacking tanks is better as a defensive fire brigade than an assault force (except against relatively weak opposition that it can outpace and overrun). As a general rule, mechanized infantry are best used with armored forces, just as they were in reality.

Icon (generic)	Technology	Year	Base cost	Prerequisites	Description	Statistics
	Motorized	1936	170 days		Motorizing infantry is the first stage to mechanizing an army. Civilian trucks are readily adapted to military uses of transporting soldiers, towing guns, and carrying equipment and supplies. This greatly increases the strategic mobility of infantry units, which would otherwise rely on marching.	1 1 Hardness: 10.0% Max Speed: 12.0 km/h Reliability: 80.0% Fuel Usage: 1.2 Production Cost: 2.50 Unlocks Motorized Infantry Manpower: 1200 Training time: 90 Recovery Rate: 0.30 Supply use: 0.11 Suppression: 2.2 Organization: 60 HP: 25.0 Weight: 0.7
	Motorized Rocket Artillery	1939	127 days	Motorized	Multiple rocket launchers such as these deliver explosives to a target area more quickly than conventional artillery, but with lower accuracy and requiring a longer time to reload. Being mounted on trucks, this version is able to launch attacks and change positions before the enemy can return fire.	1 1 Defense: 15.0 Breakthrough: 12.0 Soft Attack: 36.0 Hard Attack: 1.0 Piercing: 2.0 Reliability: 80.0% Fuel Usage: 0.1 Production Cost: 12.0 Unlocks Motorized Rocket Artillery Manpower: 500 Training time: 120 Recovery Rate: 0.10 Supply use: 0.28 HP: 0.6 Weight: 0.5
	Mechanized Equipment I	1940	170 days	Motorized	Mechanized infantry is infantry equipped with armored personnel carriers (APCs) or infantry fighting vehicles (IFVs) for transport and combat. Mechanized infantry is distinguished from motorized infantry in that its vehicles provide a degree of protection from hostile fire, as opposed to soft-skinned wheeled vehicles (trucks or jeeps) for motorized infantry.	2 1 Defense: 26.0 Breakthrough: 4.0 Hardness: 60.0% Max Speed: 8.0 km/h Armor: 10.0 Piercing: 11.0 Reliability: 80.0% Fuel Usage: 2.4 Production Cost: 8.00 Upgrades Hardness: +100%
	Mechanized Equipment II	1942	170 days	Mechanized Equipment I	Mechanized infantry is infantry equipped with armored personnel carriers (APCs) or infantry fighting vehicles (IFVs) for transport and combat. Mechanized infantry is distinguished from motorized infantry in that its vehicles provide a degree of protection from hostile fire, as opposed to soft-skinned wheeled vehicles (trucks or jeeps) for motorized infantry.	3 1 Defense: 30.0 Breakthrough: 5.0 Hardness: 70.0% Max Speed: 10.0 km/h Armor: 15.0 Piercing: 16.0 Reliability: 80.0% Fuel Usage: 2.4 Production Cost: 10.00
	Mechanized Equipment III	1944	255 days	Mechanized Equipment II	Mechanized infantry is infantry equipped with armored personnel carriers (APCs) or infantry fighting vehicles (IFVs) for transport and combat. Mechanized infantry is distinguished from motorized infantry in that its vehicles provide a degree of protection from hostile fire, as opposed to soft-skinned wheeled vehicles (trucks or jeeps) for motorized infantry.	4 1 Defense: 34.0 Breakthrough: 6.0 Hardness: 80.0% Max Speed: 12.0 km/h Armor: 20.0 Piercing: 21.0 Reliability: 80.0% Fuel Usage: 2.4 Production Cost: 12.00 Upgrades Soft Attack: +15% Hard Attack: +15%
	Basic Amphibious Tractor	1941	170 days	Mechanized Equipment I	Amphibious Tractors, or Amtracs, allow Marines to be landed on a beach under armored protection. However, this comes at the cost of poor fuel efficiency.	2 1 Defense: 26.0 Breakthrough: 4.0 Hardness: 60.0% Max Speed: 7.0 km/h Armor: 10.0 Piercing: 11.0 Reliability: 80.0% Fuel Usage: 4.0 Production Cost: 8.00 Unlocks Amtrac Batallion Manpower: 1200 Training time: 120 Recovery Rate: 0.30 Soft Attack: 0.1 Hard Attack: 0.5 Supply use: 0.18 Suppression: 1.0 Organization: 60 HP: 30.0 Weight: 1.0
	Improved Amphibious Tractor	1943	170 days	Basic Amphibious Tractor	These Amtracs feature several improvements over the base version, such as rear loading ramp for easier unloading on the beach.	3 1 Defense: 30.0 Breakthrough: 5.0 Hardness: 70.0% Max Speed: 10.0 km/h Armor: 15.0 Piercing: 16.0 Reliability: 80.0% Fuel Usage: 4.0 Production Cost: 10.00
	Interwar Armored Car	1936	170 days	Motorized	Where previous armored cars were simply commercial models with thin steel plating, this model was designed from the ground up to carry armor and light armament.	2 Defense: 2.0 Breakthrough: 12.0 Hardness: 65.0% Soft Attack: 6.0 Hard Attack: 2.0 Max Speed: 9.0 km/h Armor: 3.0 Piercing: 6.0 Reliability: 80.0% Fuel Usage: 0.8 Production Cost: 4.00 Unlocks Armored Car Manpower: 500 Training time: 180 Recovery Rate: 0.30 Supply use: 0.14 Suppression: 2.5 Organization: 10 HP: 2.0 Weight: 0.8
	Basic Armored Car	1940	170 days	Interwar Armored Car	An improved internal layout and additional ammunition storage creates a more effective armored car.	2 Defense: 3.0 Breakthrough: 16.0 Hardness: 65.0% Soft Attack: 13.0 Hard Attack: 4.0 Max Speed: 12.0 km/h Armor: 10.0 Piercing: 8.0 Reliability: 80.0% Fuel Usage: 1.8 Production Cost: 6.00
	Improved Armored Car	1942	170 days	Basic Armored Car	Changes on the battlefield require a much heavier armament and thicker armor to defeat enemy light untis and survive to report back.	2 1 Defense: 5.0 Breakthrough: 28.0 Hardness: 70.0% Soft Attack: 16.0 Hard Attack: 8.0 Max Speed: 15.0 km/h Armor: 20.0 Piercing: 36.0 Reliability: 80.0% Fuel Usage: 1.8 Production Cost: 8.00
	Anti-Tank Armored Car	1942	85 days	Improved Armored Car	Our light mechanized units will come into contact with enemy tank forces at some point. Developing a special anti-tank variant would give them a fighting chance.	2 1 Defense: 6.0 Breakthrough: 28.0 Hardness: 70.0% Soft Attack: 12.0 Hard Attack: 14.0 Reconnaissance: 1.0 Max Speed: 16.0 km/h Armor: 20.0 Piercing: 62.0 Reliability: 80.0% Fuel Usage: 1.8 Production Cost: 9.00

Special forces

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In addition to regular, motorized, and mechanized infantry, there are three specialized infantry types (Marines, Mountaineers, and Paratroopers) that are useful in specific situations. They require standard infantry equipment.

These three types of specialized infantry types are known as Special Forces or SF (not to be confused with the army doctrine Superior Firepower). Special Forces have a Battalion cap for each country. This cap is the greater of either 24 battalions or 5% of your total battalions (excluding SF battalions) making up the rest of your divisions. Divisions cannot be changed, trained, given a different template or have their template adjusted if that would result in exceeding the SF cap. To increase the 24 SF battalion cap, you would have to exceed the 480 non-SF battalion breakeven point by 20 for each additional SF battalion. For example, you would need 500 non-SF battalions for 25 SF battalions, 520 non-SF battalions for 26 SF battalions, 540 non-SF battalions for 27 SF battalions, etc.

Marines

Marines are specialized infantry trained to engage in wet terrain and perform amphibious invasions. They receive +30.0% attack in marshes, +40.0% attack when fighting over rivers, and +50.0% attack when engaging enemies during amphibious landings. Marine Divisions are very effective when supported by Engineer Companies.

Icon (generic)	Technology	Year	Base cost	Prerequisites	Description	Statistics
	Marines I	1936	170 days		Troops specializing in amphibious warfare are growing ever more indispensable. Improvised methods and equipment become things of the past as our naval infantry is supported by specialized landing craft and training.	Unlocks Marines Manpower: 1000 Training time: 120 Recovery Rate: 0.40 Breakthrough: 0.3 Supply use: 0.06 Suppression: 1.0 Organization: 70 HP: 20.0 Weight: 0.5
	Marines II	1939	127 days	Marines I	Amphibious warfare requires constant innovation. Improved logistical support and portable harbors can enable our marines to perform landings that may otherwise have been impossible.	Upgrades Soft attack: +5% Organization: +5
	Marines III	1943	170 days	Marines II	Marines can be more than just amphibious infantry. In the future, our marine corps will be among the most disciplined and organized special forces.	Upgrades Organization: +5

Mountain Infantry

Mountaineers are specialized infantry that excel in maneuvering through and engaging in rough terrain. They receive +10.0% movement, +20.0% attack, and +5.0% defense in hills and +20.0% movement, 35.0% attack, and 10.0% defense in mountains.

Icon (generic)	Technology	Year	Base cost	Prerequisites	Description	Statistics
	Mountain Infantry I	1936	170 days		Combat in mountain ranges exposes troops to many perils, but sometimes cannot be avoided. We can minimize these risks by providing our soldiers with specialized training for this environment.	Unlocks Mountaineers Manpower: 1000 Training time: 120 Recovery Rate: 0.40 Breakthrough: 0.3 Supply use: 0.07 Suppression: 1.0 Organization: 70 HP: 20.0 Weight: 0.5
	Mountain Infantry II	1939	127 days	Mountain Infantry I	Going beyond survival, our forces can be trained to use mountains to their advantage. With light equipment and mule transports, they can maneuver in this terrain better than other infantry.	Upgrades Soft attack: +5% Organization: +5
	Mountain Infantry III	1943	170 days	Mountain Infantry II	Preparing for the most arduous mountain missions in high altitudes and low temperatures will require extraordinary training and discipline from our mountain troops.	Upgrades Organization: +5

Paratroopers

While they take longer to train and only have slightly better stats than normal Infantry, Paratroopers are the only type of unit that can be paradropped into the field, which they do via transport plane. This allows them to perform operations behind enemy lines and in locations where other units cannot easily reach. The AI will use paratroopers in battle, but never uses them for paradrops.

Icon (generic)	Technology	Year	Base cost	Prerequisites	Description	Statistics
	Paratroopers I	1936	170 days		By incorporating airborne forces into our army, we can make forced entries and position key troops in previously inaccessible areas, allowing for new tactical opportunities.	Unlocks Paratroopers Manpower: 1000 Training time: 150 Recovery Rate: 0.40 Supply use: 0.06 Suppression: 1.0 Organization: 70 HP: 22.0 Weight: 0.5
	Paratroopers II	1939	127 days	Paratroopers I	Transitioning from small operations with only a few paratroopers to larger airborne divisions paves way for massive airborne landings, taking these forces beyond a novelty to a natural part of warfare.	Upgrades Soft attack: +5% Organization: +5
	Paratroopers III	1943	170 days	Paratroops II	Learning to adapt paradrop operations according to weather, standardizing equipment such as jump boots and extended specialized training will minimize the confusion and risks involved in these dangerous missions.	Upgrades Organization: +5

Special Forces Concentration

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Special forces (marines, mountaineers, paratroopers) are trained and equipped for conditions that ordinary soldiers aren’t expected to excel in. The first tech will give them a boost to acclimatization speed. Afterwards, the tree splits. One option is to train your special forces harder, to improve their skills and their ability to fight for longer before having to be resupplied. The other option is to expand the special forces training programs to accept more recruits. Your special forces will be more numerous, but come with more drag and not quite as high speed. In the end though, they will still be elite forces and will be able to develop training to make them even more skilled in fighting in the harshest of conditions. Note: The maximum quantity of special forces is capped at 24 battalions or 5% of your fielded regular battalions (this limit can be increased by unlocking the Expanded Special Forces Program technology).

Special Forces research tree

Icon (generic)	Technology	Year	Base cost	Prerequisites	Description	Statistics
	Special Forces	1938	170 days		Unconventional fighting requires specialist training. We need to ensure that our troops are prepared and able to adapt to harsh conditions.	Upgrades Hot Acclimatization gain factor: +5% Cold Acclimatization gain factor: +5%
	Advanced Special Forces Training	1940	170 days	Special Forces	With extensive training, we can ensure that our special forces will be able to perform above and beyond that of normal men. Mutually exclusive with Expanded Special Forces Program.	Upgrades Division Training Time: +10% Defense: +5% Organization: +5
	Extreme Environment Training	1942	170 days	Advanced Special Forces Training	We need to be able to fight in the harshest of environments. With the right training and equipment, our troops will be able to fight in the most extreme conditions.	Upgrades Division Training Time: +10% Supply Grace: +48 hr Hot Acclimatization gain factor: +50% Cold Acclimatization gain factor: +50%
	Expanded Special Forces Program	1940	170 days	Special Forces	Special forces are able to perform missions that ordinary soldiers can not. We need to expand the training program to get more of our soldiers qualified. Mutually exclusive with Advanced Special Forces Training.	Upgrades Capacity Multiplier: +5% Division Training Time: -10%
	Survival Training	1942	170 days	Expanded Special Forces Program	Our special forces will often fight behind enemy lines and in short supply. We need to train them to endure harsh weather and fight with limited supplies.	Upgrades Hot Acclimatization gain factor: +20% Cold Acclimatization gain factor: +20% Out of Supply: -10%
	Elite Forces	1944	170 days	Survival Training	Only the best of the best will become special forces. The soldiers that make it through the training will be stronger. faster, and fight harder than anyone else.	Upgrades Hot Acclimatization gain factor: +20% Cold Acclimatization gain factor: +20% Supply Grace: +48 hr Soft Attack: +5% Organization: +5

科研 

海军

海军 · 海军学说

空军

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工业

工程学 · 工业

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事件与决议

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