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Here's how it works: Retribution is useful if you have "free" melee units and many enemies, while Assault is better in any other situation, and also more suitable for Alpha Strike. You can safely assign Assault to another ranged unit, but Retribution won't work as often on them (including because ranged units don't live long). An additional disadvantage of Retribution is that we don't have that many tanks, plus there might be problems with the range of attacks/visibility, which should be less of an issue with other ranged units.