Abstract: Veteran women with trauma histories are at greater risk for trauma-related psychopathology and continued stressor exposure. Given that services and resources for veterans are in high demand, it is imperative to identify factors relevant to veterans who are of high need and likely to engage with treatment. This study examined treatment utilization in veteran women who were more reactive (i.e., higher need) versus resilient (i.e., lower need) to stressors. Veteran women (n = 153) with sexual assault histories who took part in a randomized clinical trial were assessed three times over 4 months. Stressor reactivity (SR) was calculated by regressing posttraumatic stress disorder symptoms onto stressor exposure. Outcomes were service utilization indices. Mixed effect models examined between-person (averages) and within-person SR (deviations from person averages) effects relating to outcomes over time. Between-person SR positively related to treatment attendance (per self-report and chart review) and resource areas that veterans reported working on and needing to work on, with evidence of small to medium effects. There was also evidence for between-person SR effects in a subsample with high stressor exposure. There was no evidence of within-person SR effects for these outcomes. There was no evidence of SR effects relating to success at obtaining resources. Results indicate that veterans in highest need of treatment (i.e., more reactive) are also more likely to attend treatment and identify areas for potential intervention. Building on these results, identifying stressor reactive veterans by monitoring of stressors and symptoms may enhance care connection and prevent entrenched stressor-related psychopathology.