What are some of the best mental health resources for veterans and service members?

SSG, there are many different resources depending on what you are looking for; might I suggestion you look at Giveanhour.org. They have a listing of the different issues they assist with to include outside of the traditional PTSD, TBI, MST. I would also suggestion looking at the Emory Healthcare Veterans Program as well as the Lone Survivor Foundation. Those are geared toward service members and veterans who need assistance with PTSD, TBI's, MST, anxiety, depression, and even family issues. https://www.emoryhealthcare.org/centers-programs/veterans-program/index.html
https://lonesurvivorfoundation.org/

For myself and many others the first place to go is your VA Medical Center. For Mental Health help, they now call it Behavior Health, it is the only place to go. It is a difficult thing to do, but they can save your life. I recently talked a good friend into starting the process and he is much better and his wife does not want to split up now. Me - 40plus years with PTSD and anger issues. The docs did a great job helping me, and I am a different person now. Just ask my wife!

DBT of South Jersey is amazing and they have virtual sessions. DBT taught me how to change the way I think which changed the way I felt and acted.