Abstract:Trauma exposure among military service members and first responders occurs at a high rate, with approximately 87% of U.S. veterans and 80% of first responders reporting exposure to at least one potentially traumatic event. There is a need for trauma-focused intervention in these populations which engages clients, provides prompt and lasting effects, and addresses existential matters faced by them. Posttraumatic growth training, such as the Boulder Crest Warrior PATHH program, has been illustrated to be effective in promoting growth and reducing symptomatology (i.e., PTSD symptoms, depression, anxiety, stress, and insomnia) at both immediate and 18-month follow-up in veteran populations. The current dissertation documents the effects observed in active military and first responder populations who have completed the Warrior PATHH 5.0, the latest iteration of the program. It presents effects on posttraumatic growth and symptomatology similar to those observed in veteran populations, providing support for generalizability of the Warrior PATHH program.