A huge conglomeration of things I was grinding on to get this. Grinding kills MG34 while brandishing the skin only PS community uses, grinding the weapons crate field order, and grinding streak kills to eventually get "Steel Curtain". Also during the match, I somehow got the mini gun in the weapons crate and it contributed kills to the nuke. Though I got overwhelmed at the "blue room" in the map thus used an M4 for the remaining kills