The Wild Weasel
Escourting a combat fighter group
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AI picks it's target as the highest Target = Attack / (Defense+HitPoints), so I tried a new design scenario: Build a Wild Weasel to protect a fleet of fighters.
If we have a tiny with 1 attack, that's 1/(6+0) = 1/6 = 0.1667. In order to protect a wing of these babies, I'll need to present a more appealing--but heavily protected--target. For instance, a medium with attack-4 can have up to defense-7 and still come in as a better target. 4/(16+7) = 4/23 = 0.1739.
And sure enough, during combat the heavily shielded Wild Weasel took all the attacks, while the fleet of cheap fighters chewed up the target! Electronic Warfare at it's best 
and don't forget your martyr has to be competetive with the enemy ships or this tactic will prove totally useless. it's not a magic bullet.