Building on her previous book, WARRIOR: How to Support Those Who Protect Us, Doc Springer has teamed with Michael Sugrue to give us the vital, essential, 'next step forward' in understanding and healing the trauma inflicted upon our first responders in these tragic, violent times…RELENTLESS COURAGE is truly the natural and essential successor to my book, ON COMBAT." - Lt. "RELENTLESS COURAGE is one of the most important books of our time. Col. Dave Grossman, whose book ON COMBAT sold half a million copies A CRUEL IRONY Our first responders are uniquely strong, brave, and emotionally flexible.