I was playing on normal, nightfall, since that is what the daily challenge required (Sniper Headshots)
I got to the pumphouse where you foind the marines, looked straight to the enemies, and noticed what looked like a BoB.
I hadn't killed one yet so I was excited, checked here, and noticed the only one mentioned, is the one at the powerhouse like the multi map.
But the one I found was at the pump station place.
I could be wrong, but it had the exact armour and everything. Any one know about it?