The rules for activating raiders say:
When activated, each Cylon raider carries out only one of the
actions listed below, taking only the first action that it is able
to perform (in numerical priority, with “Attack a Viper” taking
the highest priority and “Attack Galactica” taking the lowest)
- Attack a Viper:
area. It attacks an unmanned viper if able; otherwise it attacks a piloted viper.- If there are no vipers in its area, the Destroy Civilian Ship:
raider destroys one civilian ship in its area. The current
player chooses a civilian ship in the area and flips it over.
The resources listed on its face are lost, and the token is
removed from the game.
…
These rules leave ambiguous which ship is targeted within these categories. Which ship do raiders attack when there are multiple ships that can be targeted that are different? This can happen in two cases I’m aware of:
- There are multiple piloted vipers in the same space area (which matters for who gets sent to sickbay if there is a hit)
- There is an unpiloted viper and an unpiloted assault raptor in the same space area (the rules for assault raptors say they are treated as vipers, so these are both unpiloted vipers from a priority standpoint, and this matters in terms of difficulty to hit)