When the doctors at the field hospital found out he had a whole, working rocket inside him, there was the usual panic and screaming until someone finally calmed down enough to try and save his life. This was despite the fact that the army manual called for him to be dumped far away from everyone and treated last. Seriously, nothing makes you more unpopular to a group than having a live bomb inside you.
But the rocket was removed and doctors found it had somehow missed all of Moss' vital organs. Link -via Gorilla Mask
If you like, you can read a more accurate account on the ABC News (20/20) website: http://abcnews.go.com/2020/Story?id=3603057&page=2
Thanks for listening to a very proud sister! :)