Scott Haze confined himself to a wheelchair for a solid month in preparation for the role of Michael Adam Emory.
The rehabilitation center in California that is referred to for treating PTSD is The Pathway Home, which is located in Yountville in the Napa Valley.
The actual Adam Schumann has a small, but credited, part as the soldier who checks in Miles Teller's gun upon his homecoming at the beginning of the film.