I haven't seen this question yet, but while squad building it struck me as a possible legal interpretation. ST-321 says "when acquiring a target lock, you may lock onto any ship in the play area". FCS says "After you perform an attack, you may acquire a target lock on the defender".
I understand the intention of ST-321, but the card also says "Any ship", and it takes precedence in the stack, so can I declare a ship other than the defender as the recipient of the target lock?