Nackte Knochen

I know there ar enot more rewards for this challenge but since there are still some unused keys, I was wandering if they could be used to reward challenges. Notes: I died in an previous Expedition so lost everything, Had to go back in. Was able to go in, get everything I needed from the first mission and extract. No shots fired , no armor. Wanted to do the SILENT HUNTER Also, but no keys so took Squad Showdown to replace that. Still, This one if for the No armor.