Project Summary/Abstract In military culture, high standards are revered, yet negative aspects of overcontrol are often overlooked. Overcontrol manifests as rigid behavior, cognitive inflexibility, and a strong need for perfection. It is predominantly seen in obsessive-compulsive (OC) spectrum disorders, especially OC Personality Disorder (OCPD). On the surface, overcontrolled individuals seem composed, but internally they are emotionally turbulent. Their inclination to set high expectations for others often causes interpersonal tension straining social bonds. When grappling with mental health challenges, overcontrolled individuals, often endure with limited social support, resulting in more dire consequences. For example, Veterans exhibiting OC spectrum traits are particularly susceptible to trauma-induced anger and have a heightened risk of suicide. Treatments enhancements are urgently needed to improve interpersonal functioning, quality of life and mitigate suicide risk these vulnerable Veterans. Neuromodulation adjunctive to psychotherapy is a promising option. Key obstacles, however, impede the development of circuit-based treatments tailored to this phenotype: 1) limited validation of existing associations between interpersonal functioning and OCPD in a broader, overcontrolled sample, 2) the absence of a unified, transdiagnostic circuit model of overcontrol, and 3) robust methods for tracking gradual changes in individuals’ functioning throughout the course of treatment. This pilot project will develop methods to address these knowledge gaps. Specifically, we aim to 1) Assess the feasibility of our recruitment strategy and evaluate interpersonal functioning in a cohort of trauma-exposed Veterans exhibiting overcontrolled traits; 2) Test the feasibility and acceptability of a three-session, weekly fMRI protocol focused on the circuitry of overcontrol, while evaluating within-subject reliability of observed neural correlates; 3) Examine the feasibility and acceptability of a three-week protocol for remote monitoring of weekly variance in socio-occupational functioning and emotional regulation. This pilot initiates a multi-year research endeavor to reduce suicide risk by enhancing care for Veterans with OCPD-like overcontrol. Our venture aims to position VHA Rehabilitation R&D as a leader in precision medicine for those at risk of suicide due to cognitive overcontrol, perfectionism, and OC-spectrum disorders comorbid with PTSD, anger, or depression. Our proposal aligns with the RFA's call for innovative suicide interventions, including transformative neuromodulation strategies.