APONE **DID** Have a Night Raider/Scalemead in the film!!!
Everyone knows by now Apone was photographed in pre-production costuming with the knife clipped to his shoulder bell. It obviously didn't appear there in the final costume.
But while trying to see how exactly he secured his VP70, I noticed something. It appears he moved the knife to his Right grenade strap, handle down (much like Hicks, just opposite strap). Its not easily visible because he strapped his VP70 across the top of the sheath, but it looks like the handle does indeed poke out!
I will try to get a better and more definitive pic, but that black and white one from the hive looks pretty good to me.
Worthless gear trivia I guess. Still no knife on Dietrich or Ski (at least none I've seen) but I think its a fun fact that 7 out of 9 marines were toting blades on screen.