An example of "Role Level" bonuses...

Commando
Role Level 1: Damage Boost (Self) is x2.0, Damage Boost (Allies) is x1.05
Role Level 2: Damage Boost (Self) is x2.1, Damage Boost (Allies) is x1.05
Role Level 3: Damage Boost (Self) is x2.2, Damage Boost (Allies) is x1.10
Role Level 4: Damage Boost (Self) is x2.3, Damage Boost (Allies) is x1.10
Role Level 5: Damage Boost (Self) is x2.5, Damage Boost (Allies) is x1.15

Hope that makes things a little clearer. If anyone wants to know the others, I can make a thread... just let me know.