Support Tree
corporal: Extra Gear (Grants +1 extra use for any item and non-damaging grenades carried in a utility slot.)
sergeant: Quick Patch (Medkits no longer use an action to heal.)
lieutenant: Triage (AOE heal removes status effects. 1 use per mission.)
captain: Medic Training (Grants +2 extra uses for any medkit item carried in any utility slot, and gain +2 mobility.)
major: Renewal (All allies within range gain 1 HP at the beginning of every turn.)
colonel: Armor Plates (The support brings additional armour plating that can be applied to a soldier in the field, granting them 2 points of armour and 1 ablative armor. Has only 3 uses per mission.)

Battery Tree
corporal: Taser Expert (Your Arc Thrower now has a bonus to hit, and disorients the target when it misses.)
sergeant: Jolt Awake (You fire your arc thrower to revive stunned, dazed or unconscious allies.)
lieutenant: Energy Shield (The support and all nearby allies within 5 meters gain 7 shielding for 5 turns. 5 Turn cooldown.)
captain: Shock Master (Your Arc thrower has an attack that can harm non robotic enemies, and arc thrower attacks no longer end your turn.)
major: Extra Grenades (Grants +1 additional grenade ues, for every one carried in any utility slot.)
colonel: Chain Lightning (Fire your Arc Thrower at every visible enemy who is capable of being stunned. Five-turn cooldown.)

Combat Tree
corporal: Put them Down (Gain bonus aim against stunned, panicked, or stunned foes.)
sergeant: Warden (Grants +10 Aim on Overwatch shots and allows them to crit.)
lieutenant: Ready For Anything (Will automatically go into overwatch when taking a shot with a primary firearm.)
captain: Surgical Precision (Reduces aim penalties from cover by half. Does not apply to reaction fire.)
major: Rapid Reaction (When in overwatch, each shot you hit with grants another reaction fire shot, up to a maximum of two additional shots.)
colonel: Coordinate Fire (Soldier fires and all adjacent allies also shoot target.)