• Johanna Barron, Virginia F Randall, Charisse Villareal, Valentina Ramirez, and Leslie Vojta.
• Medical School Class of 2021, F. Edward Hebert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA.
• Mil Med. 2021 Nov 2; 186 (11-12): e1066-e1070.

IntroductionOperation Bushmaster, a 5-day high-fidelity medical practicum bringing together fourth-year medical students, graduate nursing students, international students, and physicians and other medical professionals in emergency and operational medicine from across the world, is the capstone event of the Uniformed Services University of the Health Sciences's Military Unique Curriculum. It is designed to simultaneously test students' medical knowledge, leadership skills, and grace under fire. For many students, this experience represents one of the first times that they concurrently inhabit the dual roles of military officer and (soon-to-be) physician. This is likely the most "tactical" and stressful military simulation that many students have experienced.MethodsIn this qualitative study, we analyzed a data set of 49 de-identified reflective articles written by fourth-year medical students following the completion of Bushmaster, in order to understand what students gained from the experience. Additionally, we evaluated students' responses through the lens of the threshold concept, looking for ontological shifts, integration, discursiveness, and troublesomeness during students' Bushmaster experiences.ResultsWe identified 10 themes throughout the essays that highlighted the lessons learned during the Bushmaster experience, including its importance in guiding professional identity formation and students' deepened understanding of the unique responsibilities and pressures of the role of military physician.ConclusionOne of the resulting themes, "the military physician," met our criteria for a threshold concept, in that it was transformative, integrative, and troublesome. Before Bushmaster, many of the students saw themselves simply as medical students rather than as almost doctors. Following the field practicum, some identified more strongly with the role of military physician, while others continued to overestimate the amount of time remaining to complete the transformation from student to doctor or to integrate the roles of physician and military officer. Moreover, we identified the entirety of Bushmaster as a threshold experience. This work serves to further describe the liminal space in which military medical students reside on their journey to physician, as well as the moment of realization by many that becoming a military physician encompasses more than simply the sum of the roles of physician and military officer.Published by Oxford University Press on behalf of the Association of Military Surgeons of the United States 2021. This work is written by (a) US Government employee(s) and is in the public domain in the US.

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