Bomber Tree
Corporal: High Power Grenade (Grenades used by the Fuze pierce enemy's armor and shred armor more effectively) Can be an AWC perk.
Sargeant: Collateral Damage (Destroys cover and deals some damage to enemies in blast radius.)
Lieutenant: Volatile Mix (Same as vanilla Skill.)
Captain: Salvo (Same as vanilla Skill.)
Major: Heavy Ordinance (Same as vanilla Skill.)
Colonel: Interrupt (Same as vanilla Skill.)

Grunt Tree
Corporal: Aggression (Gain +5 critical chance for each enemy you can see, up to a maximum of 20.) Can be an AWC perk.
Sargeant: Piercing barrage (Unique perk, allows you to attack foes behind cover, and also destroy said cover).
Lieutenant: Weapons expert (A unique perk, Fuze gets 2 heavy weapon (a.k.a Flamethrowers or missiles) uses instead of one). Can be an AWC perk.
Captain: Tactical Pockets (All limited-use items in your inventory receive 1 extra use.)
Major: Damage Control (After taking damage, gain three armor through the end of the next turn.)
Colonel: Rapid Fire (Same as vanilla Skill.)

Shield Wall Tree
Corporal: Safeguard (shots against adjacent allies have less chance to hit.)
Sargeant: Protect and Serve (Gain a non mevement action point after using shield wall.)
Lieutenant: Avenger (When a nearby ally is shot, soldier takes a reaction shot aginst the enemy.)
Captain: Shoulder to Lean on (Nearby allies gain a bonus to aim.)
Major: Faultless Defense (Soldier cannot be crit while Shield wall is active.)
Colonel: Rampart (Ability when activated reduces all damage nearby allies take for a brief time.)