Not sure if this is intentional or a bug or if I'm doing something wrong.
Multi-faction conventional Earth start. One faction wants to use PDCs to destroy their enemies shipyards. I've turned Active Sensors on, relations are hostile, but neither Missile Bases with the old, pre-TN ICBMs nor new PDCs with TN-missiles can target the shipyards. Populations and other PDCs, yes. They don't show up on the target list - neither in the Combat Settings tab for Individual Unit or the Combat Assignments Overview screen.