Background – Military Sexual Trauma (MST) among women Veterans is a problem of epidemic proportion associated with significant mental health and functional impairment and substantial access to care barriers. Surveillance data indicate that one in four women Veterans reports MST when screened. Compared to women Veterans with other service-related stressors, those experiencing MST have greater mental health problems, are more likely to report difficulty in functioning in social, family and intimate relationships and are more likely to be unemployed and to report difficulties in finding a job. Nevertheless, women with MST engage less frequently in VA health care than other women Veterans. Barriers to care include distance from specialty services, financial difficulties, childcare and family responsibilities, and gender-related discomfort in male- dominated VA facilities. Research over the past decade has identified the problems and concerns of women Veterans with MST but programs addressing their mental health needs and responsive to identified barriers are lacking. The proposed study addresses this gap by evaluating a gender-sensitive, evidence-based skills training program delivered via home-based video technology. Specific Aims – The study will conduct a Hybrid Type 1 effectiveness-implementation study to accomplish two aims. The first is to determine the effectiveness of the HBVT-delivered, Skills Training in Affective Regulation (STAIR) relative to a HBVT-delivered nonspecific active comparator, Present Centered Therapy (PCT) among women Veterans with MST. It is hypothesized that STAIR will be superior to PCT in regards to improvement in CAPS PTSD symptoms (primary outcome) as well as in perceived social support and social engagement (secondary outcomes). The second aim is to conduct a multi-stakeholder, mixed method evaluation to inform future potential implementation plans by identify barriers and facilitators of implementing STAIR via HBVT and to contextualize and interpret the quantitative data on treatment processes and clinical effectiveness. Methodology – This is a four-year, two-site Hybrid Type 1 effectiveness-implementation study design. A total of 200 women Veterans with MST and PTSD symptoms (with DSM-5 PTSD Screen cut-off > 3) will be enrolled into the study. Participants will be stratified by rurality status in a proportion representative of the national population (34% rural vs. 66% nonrural). Stratification will ensure that resources are dedicated to recruit the identified number of rural women. Within each level of stratification, participants will be randomized into one of two treatments conditions, STAIR or PCT, each of which is comprised of 10 weekly sessions. Assessments will be conducted at five time-points: baseline (week 0), midtreatment (week 5), immediately posttreatment (week 10), 2-month follow-up (week 18) and 4-month follow-up (week 26). Rurality will be included as a covariate and assessed for variations in aspect...