Congratulations. I have a Sailor in my office who is Muslim. Boy do they have to sacrifice. It is incredible. No food from sun up to sun down...I was proud of the other Sailors in the office who ensured that they respected him with regards to food. We did not have any lunch outings during that time, but we are having a huge party for his reenlistment on Friday. He is really good because he is very humble and does not throw his beliefs in the Sailors faces. Not the norm that is for sure.
They usually are nice quiet people, until they go besirk. So don't worry, he may be quiet, but has probably already imagined 10,000 ways of how he's going to dispatch you.