Overhauls the classes by disabling the vanilla game's classes (excluding Psi Operatives) and adding 8 classes. Also changes the layout of the perk trees. Starting at the Squaddie rank, classes have mandatory perks they take at every other level. As for the other 3 ranks, you can choose from 3 perks, depending on how you'd like to further customize your characters. This gives classes more focused roles while still allowing for some flexibility. These classes also have custom icons (The Psi Operative class also has a custom icon so it matches the new ones, but there are otherwise no changes to the class itself) 

IMPORTANT: Requires Enhanced Perk Tree in order to work properly, which can be downloaded from either of these links: 
http://www.nexusmods.com/xcom2/mods/153/? 
http://steamcommunity.com/sharedfiles/filedetails/?id=621327373 

The mod currently does not add any new skills to the classes. (However, I am tinkering with creating new skills using the mod tools, so they may come in a future update. No promises, though.) 

Note: This mod may not be 100% balanced, but I have tried to maintain as much balance as I can. Please provide feedback if you think something should be tweaked or changed! 

RAIDER
A front-line CQB combatant, the Raider can equip Shotguns but specializes in melee damage. They can also choose from skills to enhance their survivability, movement, and Shotgun proficiency. Raiders gain small Aim bonuses and moderate Health bonuses as they level up.

Squaddie: Slash and Blademaster 
Corporal: Ever Vigilant, Deep Cover, or Shredder 
Sergeant: Run & Gun 
Lieutenant: Implacable, Blast Padding, or Aim 
Captain: Bladestorm 
Major: Shadowstep, Untouchable, or Chain Shot 
Colonel: Reaper 

ASSASSIN 
Our Assassins are stealthy units that strike from the shadows with Sniper Rifles or Pistols. Though they don't have Squadsight like Hitmen do, they can choose from skills to improve their movement, pistols, or rifles. Assassins gain moderate Aim and Hacking bonuses as they level up.

Squaddie: Fire Pistol and Conceal 
Corporal: Implacable, Return Fire, or Aim 
Sergeant: Phantom 
Lieutenant: Ever Vigilant, Lightning Hands, or Deadeye 
Captain: Shadowstrike 
Major: Shadowstep, Faceoff, or Death From Above 
Colonel: Serial 

HITMAN 
Hitmen are capable of taking out enemies from a distance with Sniper Rifles or up-close with Swords. Choose from abilities that enhance swords, accuracy, or stealth. Hitmen gain large Aim bonuses as they level up. 

Squaddie: Slash and Squadsight 
Corporal: Bladestorm, Longwatch, or Shadowstrike 
Sergeant: Deadeye 
Lieutenant: Implacable, Aim, or Shadowstep 
Captain: Death From Above 
Major: Blademaster, Hail of Bullets, or Conceal 
Colonel: Rupture

GUNMAN (was Outlaw)
Gunmen are recruits with little military experience, but have proven to be effective with small arms. However, with practice, they can improve their skills with Assault Rifles, supporting abilities, and movement. Gunmen gain moderate Aim bonuses and small Health bonuses as they level up. 

Squaddie: Fire Pistol and Quickdraw 
Corporal: Aim, Holo Targeting, or Ever Vigilant
Sergeant: Return Fire 
Lieutenant: Chain Shot, Suppression, or Covering Fire
Captain: Faceoff 
Major: Hail of Bullets, Field Medic, or Killzone
Colonel: Fan Fire 

JUGGERNAUT 
The sturdiest of all units, Juggernauts are defensive soldiers that use Cannons and Grenade Launchers. They can choose from skills to further enhance their grenades, cannons, or overwatch fire. Juggernauts gain large health bonuses as they level up. 

Squaddie: Launch Grenade and Blast Padding 
Corporal: Volatile Mix, Suppression, or Covering Fire 
Sergeant: Untouchable 
Lieutenant: Heavy Ordnance, Demolition, or Guardian 
Captain: Deep Cover 
Major: Salvo, Hail of Bullets, or Killzone 
Colonel: Regeneration

SAPPER 
Sappers are expert demolitionists that use Shotguns and Grenade Launchers. Their secondary skills improve weapon damage, support abilities, and survivability. Sappers gain moderate bonuses to health as they level up, and start with a bonus ability: Biggest Booms, giving grenades a chance to crit.


Squaddie: Launch Grenade, Heavy Ordnance, and Biggest Booms
Corporal: Steady Hands, Shredder, or Deep Cover 
Sergeant: Volatile Mix 
Lieutenant: Chain Shot, Demolition, or Blast Padding 
Captain: Salvo 
Major: Deadeye, Holo Targeting, or Untouchable 
Colonel: Saturation Fire 

ENGINEER 
Engineers are robotics experts equipped with Cannons and Gremlins. Choose from secondary abilities that increase effectiveness of the Gremlin, overwatch fire, or explosives. Engineers gain large Hacking bonuses as they level up. 

Squaddie: Aid Protocol and Hack 
Corporal: Scanning Protocol, Ever Vigilant, or Demolition 
Sergeant: Combat Protocol 
Lieutenant: Threat Assessment, Guardian, or Volatile Mix 
Captain: Haywire Protocol 
Major: Medical Protocol, Killzone, or Salvo
Colonel: Capacitor Discharge 

MEDIC 
The Medic, as the name implies, keeps our troops healthy on the battlefield. They use Gremlins and Assault Rifles, and can learn skills to enhance their support abilities, overwatch fire, or Gremlin abilities. Medics are extremely weak compared to the other classes, but start with two additional abilities: Mark Target and Energy Shield. They are powerful support units, but should be kept out of danger when possible.

Squaddie: Aid Protocol, Field Medic, Mark Target, and Energy Shield
Corporal: Holo Targeting, Guardian, or Scanning Protocol 
Sergeant: Revival Protocol 
Lieutenant: Suppression, Covering Fire, or Threat Assessment 
Captain: Medical Protocol 
Major: Shredder, Killzone, or Combat Protocol 
Colonel: Restoration 

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To re-enable the vanilla classes follow these steps: 

1.Navigate to your steam installation folder, typically C:\Program Files\Steam or something similar. 
2. Go to: ...\steam\steamapps\workshop\content\268500\663914425\Config\XComClassData.ini 
3. Delete the following lines: 

[Ranger X2SoldierClassTemplate] 
-NumInForcedDeck=1 
-NumInDeck=4 

[Sharpshooter X2SoldierClassTemplate] 
-NumInForcedDeck=1 
-NumInDeck=4 

[Grenadier X2SoldierClassTemplate] 
-NumInForcedDeck=1 
-NumInDeck=4 

[Specialist X2SoldierClassTemplate] 
-NumInForcedDeck=1 
-NumInDeck=4 

4. To disable specific classes that this mod adds, delete those same lines (NumInForcedDeck and NumInDeck) from each of the class templates that you'd like to ignore. For example, if you wanted to remove the Raider class, you would find [Raider X2SoldierClassTemplate] and delete those lines under it.
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GREAT MODS FROM OTHER AUTHORS: 

Grenades Damage Falloff (makes Sapper and Juggernaut classes feel more balanced)
http://www.nexusmods.com/xcom2/mods/206/?

Cost Based Ability Colors 
http://www.nexusmods.com/xcom2/mods/544/? 

Diverse Patterns 
http://www.nexusmods.com/xcom2/mods/321/? 

Uniform Manager 
http://www.nexusmods.com/xcom2/mods/285/?