Does Marching Orders prevent me from marshaling locations and attachments as duplicates?
Yes. As previously ruled, Marching Orders does not allow you to initiate the action of “marshal a location” or “marshal an attachment,” regardless of the fact that the card will end up being a duplicate.
[Danny Schaefer, 04.09.2018]
Can I marshal locations and attachments into shadows while I have Marching Orders revealed? Can I bring events out of shadows?
Yes, you can marshal locations and attachments into shadows. No, you cannot bring events out of shadows—playing an event from shadows is subject to the same restriction as playing an event from hand.
[Danny Schaefer, 07.06.2018]