I'm looking over marine roles in chapters, and I honestly can't think of anything unique as of yet. Games Workshop seems to have covered a lot of the bases...and unless we choose to go full blood angel and introduce the EXTREMELY broken librarian dreadnought, I can't think of anything.
As an aside, is it a strange hope that in an 'oh shit' moment, some of the legion of the damned show up? They've always seemed interesting to me...then again, I'm just rambling now, so I'll hush.
As an aside, is it a strange hope that in an 'oh shit' moment, some of the legion of the damned show up? They've always seemed interesting to me...then again, I'm just rambling now, so I'll hush.