Nick Wood is a U.S. Navy SEAL.
At least he is in the first recorded adventure and as they say about any tough military organization, once you make it in, you are always in one way or another. That is definitely the case with Wood.
As we learn at the very beginning of that adventure, Wood has been a SEAL for some time, long enough to have earned the rank of Captain. It is in that skirmish, though, we learn how he came to decide he was done with it. A particularly harrowing mission almost resulted in his killing a couple of innocent children. While no one was actually harmed, he knew the desire to be in such a situation again was gone.
Luckily for him, though life and duty forced him to stick around in the Service for a tad longer, his mission would require him to go undercover to Ecuador as a member of the Peace Corps (rather appropriate for his new outlook) and it would be there he met Gabriella, a young woman who would become his life companion. And that is when his occupation would change as well.
For the next couple of adventures, Nick Wood is in the funeral business.
Now, there are a huge number of members of the cloak-and-dagger world who could be said to work in the death industry but Wood is the first I have encountered who is there after the action is over. It becomes his new job in life to be there to assist in people's time of grief.
That does not mean, though, that the world of danger leaves him alone. It calls on more than one instance, much to the dismay of both Wood and Gabby.