Certainly an experience you don't hear of too much. World War II vet honored 60-plus years later for bombing mission - CNN.com
Two thoughts: 1) Was he Jewish - his name sounds as though he could have been - and was that why he was sent to a concentration camp? 2) So if some Luftwaffe officers were sent on tours of concentration camps, they can't claim they didn't know what was going on. And they only spoke up for fellow aviators, not the other inmates. But to be fair, there wouldn't have been a lot else they could do, without actually ending up under arrest or worse.
Moser is also a hispanic name .... but heres something else .... ! The Joe Moser Story - A Fighter Pilot in Buchenwald Annie