I'm pretty sure a study hasn't been done on that. Again, we just don't have enough funding for mental health research. I think it's really important to remember that most of the time we're not guided by evidence, and it's really important to invest in that.
I think identity, especially when you have a young veteran, is a very important issue. For someone who is struggling with PTSD and depression and is released on a medical leave, trying to figure out what they're going to do in their 20s and 30s is very challenging.
I haven't seen literature that's directly compared other police to veterans. I'm not sure if Dr. Cramm has.