I'm still trying to wrap my head around the ethos of the Space Marines, so I've got a question.
A squad/platoon gets a mission to find a relic and deliver it somewhere (I suppose the where might matter, but I don't think so). If I have to choose a location for the purpose of this question, let's say it's to be delivered to the chapter master at a hugely important watch fortress.
The information the squad has it that the relic It is supposed to be ancient and sacred and will help the chapter grealty in its duties (they're looking for the holy grail).
After a hardfought battle, the marines find it has been tainted and warped by chaos beyond all redemption. The relic is terribly dangerous and corrupting.
Do they destroy it? Do they take it (wherever), knowing that if they do so (wherever) is doomed? Do they lie, "yeah...we had it...then it accidently blew out the airlock into the sun...."
Is destroying the relic a blemish on their honor, if the true circumstances are known? Would bringing the thing back knowing what will happen a greater stain on their honor?