[Suicide Junkie]

On the fighter, perhaps. They are also usable on ships and bases, which need to account for the shots spread over multiple combats.

The EM-CSMs can be fired a second time in combat if you have enough supply points and survival time.

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The fighter drives alternate bigger/faster, then smaller/tougher
They are grouped by speed. The level 2 is faster than level1, while the level 3 is the same speed as 2 but smaller.
Thus #3 obsoletes #2, but not #1, since #1 is still smaller than #3