Just looking at it, right off the bat, it seems like he would make a good scout. If need be, taking over the body of an animal that died, if he can take over animals that is, he can move about mostly unnoticed by others and get a lay of the land. Beyond that there are always ways to use a person. Primarily focus on the rifle aspect of your weapon and you can easily be used as a screen for other people to set up attacks.
Even then, depending on how fast he can dig with his shovel, making traps in the ground or ambush sites later on is a big bonus for what he could do.