A substantial proportion of Australian emergency service personnel experience rates of psychological distress (anxiety and depression), posttraumatic stress disorder, and suicidal thoughts that are considerably higher than the national average (Beyond Blue, 2018). Within a randomised trial, the PEREI project undertook a 3-pronged approach to reduce risk of posttraumatic psychopathology and psychological distress, and to improve wellbeing through programs for: (1) responders in their first five years of service, (2) their significant partners and/or other significant adults, and (3) supervisors in the service. The programs comprised guided self-help online interventions with the support of a wellbeing coach (7-week program for early career members, 6-week program for significant others) or 4-week live group (supervisors). A group (intervention, waitlist) by time (pre-, post-, with 6-, 12-month follow-up) design was used, with further 2-year follow-up underway. In total, over 650 individuals from paid and volunteer services were recruited (police, fire, and paramedicine trainees). Efficacy was measured with standardised instruments across a range of domains such as psychological distress including posttraumatic stress, wellbeing, resilience, social support, supervisor and organisational support, and operational stress. Health service utilisation and work absence were outcomes also indexed. Final data is being collected and key observations regarding uptake, lessons learned, initial findings, and consideration for future implementation will be presented.