Background Many active-duty military physicians working primarily in Military Treatment Facilities (MTFs), lack breadth and volume of clinical experience to sustain highly perishable expeditionary medical skills. Subsequently, Military-civilian partnerships (MCPs) were established to address this gap by integrating military physicians into high-volume civilian centers. Since 2001, civilian hospitals have been selected as sites for the United States Air Force’s Center for Sustainment of Trauma and Readiness Skills (C-STARS). Embedded personnel at these sites have dual roles of teaching formal readiness courses and providing clinical services to high acuity patient populations. Embedded military Emergency Physicians (EPs) at C-STARS Cincinnati have clinical responsibilities at two hospitals in the University of Cincinnati system— University of Cincinnati Medical Center (UCMC) and West Chester Hospital (WCH), level I and level III trauma centers respectively. While prior research has demonstrated improved clinical exposure for embedded military providers and successful surgeon integration at MCPs, no study has evaluated EP integration at MCPs. The Knowledge, Skills, and Abilities (KSA) diagnosis score is a metric of pre-deployment readiness that assess the breadth of conditions treated by EPs. We hypothesized that military EPs have similar KSA diagnosis scores per Full Time Equivalent (FTE) percentage, as their non-military counterparts, demonstrating successful MCP integration. Methods Retrospective data from 2018-2023 were gathered from UCMC and WCH. Billed ICD-10 codes for all patient encounters were collected, and KSA scores were calculated for each physician by year as defined by the KSA Program Management Office (KSAPMO). We defined FTE as 1440 hours per year. All EPs’ hours were obtained retrospectively through shift administrators, and % FTE for the year was calculated. We calculated a KSA to FTE ratio by dividing each EPs annual KSA by their calculated FTE. KSAs and KSA/FTE ratios were compared using a generalized linear model with estimating equations accounting for repeated measures over time. Finally, we calculated the percentage of military EPs meeting their annual readiness threshold as defined by the KSAPMO. Results We identified 4 military and 90 civilian EPs between 2018-2023. Military EPs worked significantly less FTE than their civilian counterparts (22.5% vs 45.7% FTE respectively) and generated significantly fewer KSA points than their civilian counterparts (mean 122,324 +- 28,586 vs mean 268,283 +- 15,802, p < 0.01). However, there was no difference after normalizing for FTE (military 7,636 +- 1,114 per % FTE vs civilian 7,485 +- 356 per %FTE, p = 0.89), suggesting similar clinical productivity and acuity. Even at a lower % FTE, all military EPs met their KSA threshold, except for 2018 one military EPs deployed, and one separated from the military Discussion: This is the first study to evaluate EP integration at an MCP. Our data suggests that military EPs see similar productivity and acuity per FTE as their civilian counterparts, demonstrating successful EP integration. Importantly, embedded military EPs at this site meet KSA diagnosis score thresholds at under 10% FTE. Pre-deployment procedural metrics were not assessed. Further research will assess differences in acuity and differences in procedures performed between civilian and military EPs.