Introduction: Cardiovascular complications of coronavirus disease 2019 (COVID-19) infection, including myocarditis, have been widely reported. Research question/hypothesis: What was the incidence and clinical implications of viral myocarditis resulting from COVID-19 infection in hospitalized United States active-duty service members (US ADSM)? Goal/aims: Report the incidence of complications in US ADSM who suffered COVID-19 associated myocarditis. Methods: This retrospective observational cohort study from the Joint Trauma Service COVID-19 Registry included 399,284 US ADSM who contracted COVID-19 infection. Our team independently reviewed records of hospitalized US ADSM who were determined to have COVID-19 associated myocarditis. Results: Among the 399,284 US ADSM who contracted COVID-19, 1,629 (0.4%) required hospitalization and 18 (1.1%) met criteria for myocarditis. The most common presenting symptoms were chest pain (72%) and dyspnea (67%). Half of the patients required ICU level care of which 44% required inotropes or vasopressors, and one patient required mechanical circulatory support. Eight (44%) patients had clinical findings consistent with acute heart failure and two (11%) patients suffered intermittent advanced heart block that did not require permanent pacing. No patients died in the hospital. In the patients who had a left ventricular ejection fraction of less than 50% during their illness, 75% had full recovery of their left ventricular systolic function during follow up imaging. Conclusions: While myocarditis was an uncommon complication in US ADSM hospitalized for COVID-19, its clinical course was not benign.