Shauna Springer, the chief psychologist for Stella Center, is one of the nation's leading experts on PTSD and trauma. Known as "Doc Springer" in the military and veterans' communities, she has worked with hundreds of veterans over the past decade. Her latest book, "Warrior: How to Support Those Who Protect Us," published on May 18. The views expressed here are her own.
(CNN)Marine Corps veteran Brian Vargas is still triggered by the sound of fireworks.