On September 12, 2013, the 15th subject was enrolled in our ongoing study of MDMA-assisted psychotherapy for 24 U.S. veterans, firefighters, and police officers with service-related PTSD. The 14th subject received their second experimental session on August 9, and their third and final session on September 13. On August 28, the Institutional Review Board approved several changes to the study protocol. These amendments included changes to dosing strategy (adding a 100 mg dose), adjustments in visit schedules, and additional treatment outcome and safety measures.