Wolf has one, he got it as his PvP Champion Reward.
It has a bug, which makes it OP! But without the bug it's questionable... could be great in some situations, otherwise pretty costly.
There's one other person with one? KZK said he saw another one in PvP, besides Wolf.
Yes, it's Raid Reward only, like Ramcke from Gazala Hard. I asked the devs if it was only from Expert or what? But they didn't answer.
Platoon News: We can do
Expert First if y'all like! Several guys have gotten better decks now, and everyone is hitting it so there should be no trouble doing Expert then Hard. EliteJager is just as good as Redrain was, he's a tiger!

We can always just do Exp/Easy if there's trouble. Like FS being down, or bugs eating our tickets.
We need to average 60+K per week to do Hard/Med/Easy... right now we average around 45-50... soon!! Soon we can hit 3x Raids a week I hope.
If Expert murders you bad? Get a few tickets in there to get your reward Points anyhow! The switch to hard if it looks like that is next. You can always ask here, I check for comments every day

Twice usually.
NOTE: Team raid Tickets refresh an HOUR before the Raid ends! Thus for me? At 2 AM I get new tickets, and the Raid isn't over until 3 AM. So if we need just 1-2 more hits? There's a way to do that. Our Euro-players have been doing it for a while now, but I had no idea how! Thanks guys! It's a big help! I can do it too, if I don't work on Wednesday...
Edit Update: Yay! I took down the Med Solo Raid in 7 tickets! An amazingly lucky thing. The last day I needed 883? I did around 990 total! The last day of the last ticket had 7 life, I did 110

That Pak had nothing, but I sure had fun!! 3x Solo Raids, all because
I Fought Bravely!! and didn't give up.