If you want to easily copy Mechatronic's ability tree to something like A Better Barracks, here it is. It's also a good reference for knowing which abilities to assign to which weapon slot.

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; squaddie
+SoldierRanks=(AbilitySlots=((AbilityType=(AbilityName="Reboot")), \\
(AbilityType=(AbilityName="RepairMW", ApplyToWeaponSlot=eInvSlot_SecondaryWeapon)), \\
(AbilityType=(AbilityName="Overdrive", ApplyToWeaponSlot=eInvSlot_PrimaryWeapon)), \\
(AbilityType=(AbilityName="RoboticChassis", ApplyToWeaponSlot=eInvSlot_Unknown)), \\
(AbilityType=(AbilityName="Arsenal", ApplyToWeaponSlot=eInvSlot_Unknown)), \\
(AbilityType=(AbilityName="IntrusionProtocol", ApplyToWeaponSlot=eInvSlot_SecondaryWeapon))), \\
aStatProgression=((StatType=eStat_Offense,StatAmount=0), (StatType=eStat_HP,StatAmount=0), (StatType=eStat_Strength,StatAmount=1), ;(StatType=eStat_Hacking,StatAmount=25), (StatType=eStat_CombatSims,StatAmount=1)))

; corporal
+SoldierRanks=(AbilitySlots=((AbilityType=(AbilityName="Collateral", ApplyToWeaponSlot=eInvSlot_PrimaryWeapon)), \\
(AbilityType=(AbilityName="KineticStrike", ApplyToWeaponSlot=eInvSlot_Unknown)), \\
(AbilityType=(AbilityName="AdaptiveAim", ApplyToWeaponSlot=eInvSlot_PrimaryWeapon))), \\
aStatProgression=((StatType=eStat_Offense,StatAmount=3), (StatType=eStat_HP,StatAmount=0), (StatType=eStat_Strength,StatAmount=0), ;(StatType=eStat_Hacking,StatAmount=5), (StatType=eStat_CombatSims,StatAmount=0)))

; sergeant
+SoldierRanks=(AbilitySlots=((AbilityType=(AbilityName="HeavyRepair", ApplyToWeaponSlot=eInvSlot_SecondaryWeapon)), \\
(AbilityType=(AbilityName="ConcussiveStrike", ApplyToWeaponSlot=eInvSlot_Unknown)), \\
(AbilityType=(AbilityName="RapidRepair", ApplyToWeaponSlot=eInvSlot_SecondaryWeapon))), \\
aStatProgression=((StatType=eStat_Offense,StatAmount=3), (StatType=eStat_HP,StatAmount=0), (StatType=eStat_Strength,StatAmount=0), ;(StatType=eStat_Hacking,StatAmount=5), (StatType=eStat_CombatSims,StatAmount=0)))

; lieutenant
+SoldierRanks=(AbilitySlots=((AbilityType=(AbilityName="LayeredArmour")), \\
(AbilityType=(AbilityName="Obliterator")), \\
(AbilityType=(AbilityName="Rainmaker", ApplyToWeaponSlot=eInvSlot_Unknown))), \\
aStatProgression=((StatType=eStat_Offense,StatAmount=3), (StatType=eStat_HP,StatAmount=0), (StatType=eStat_Strength,StatAmount=1), ;(StatType=eStat_Hacking,StatAmount=5), (StatType=eStat_CombatSims,StatAmount=0)))

; captain
+SoldierRanks=(AbilitySlots=((AbilityType=(AbilityName="RedundantSystems")), \\
(AbilityType=(AbilityName="BrawlerProtocol", ApplyToWeaponSlot=eInvSlot_Unknown)), \\
(AbilityType=(AbilityName="Bombardment", ApplyToWeaponSlot=eInvSlot_SecondaryWeapon))), \\
aStatProgression=((StatType=eStat_Offense,StatAmount=2), (StatType=eStat_HP,StatAmount=0), (StatType=eStat_Strength,StatAmount=0), ;(StatType=eStat_Hacking,StatAmount=5), (StatType=eStat_CombatSims,StatAmount=0)))

; major
+SoldierRanks=(AbilitySlots=((AbilityType=(AbilityName="Triangulation")), \\
(AbilityType=(AbilityName="LightningStrikeMW", ApplyToWeaponSlot=eInvSlot_Unknown)), \\
(AbilityType=(AbilityName="Neutralize", ApplyToWeaponSlot=eInvSlot_SecondaryWeapon))), \\
aStatProgression=((StatType=eStat_Offense,StatAmount=2), (StatType=eStat_HP,StatAmount=0), (StatType=eStat_Strength,StatAmount=0), ;(StatType=eStat_Hacking,StatAmount=5), (StatType=eStat_CombatSims,StatAmount=0)))

; colonel
+SoldierRanks=(AbilitySlots=((AbilityType=(AbilityName="Sacrifice", ApplyToWeaponSlot=eInvSlot_Unknown)), \\
(AbilityType=(AbilityName="Supernova", ApplyToWeaponSlot=eInvSlot_Unknown)), \\
(AbilityType=(AbilityName="Overclock", ApplyToWeaponSlot=eInvSlot_SecondaryWeapon))), \\
aStatProgression=((StatType=eStat_Offense,StatAmount=2), (StatType=eStat_HP,StatAmount=0), (StatType=eStat_Strength,StatAmount=1), ;(StatType=eStat_Hacking,StatAmount=5), (StatType=eStat_CombatSims,StatAmount=0)))