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Introduction: Influenza infection in the United States results in hundreds of thousands of hospitalizations and 12,000 to 60,000 yearly deaths. Influenza season sees a sharp increase in emergency department (ED) patients nationwide, as primary care offices become overwhelmed. Because the ED is unique in its reach of underserved communities, ED vaccination programs can help maximize the number of people protected by vaccination. Influenza vaccination is one of the only vaccines that occurs yearly; therefore, successes with ED distribution of the influenza vaccine can potentially be translated into efforts of vaccinating the U.S. population more efficiently against other viral illnesses, such COVID-19. There has also not been a previous description in the literature of a vaccination program being used in a military setting. The original purpose of this study was to measure the effect of an ED vaccination program on our vaccine penetration and ED length of stay as well as to analyze the impact of provider education on vaccine uptake on vaccine refusal., Methods: This was an observational, quality improvement project in the Wright-Patterson Medical Center Emergency Department evaluating an influenza vaccination program set to last from October 1, 2020 to April 1, 2021. Patients were to be surveyed to assess prior vaccination status, identify those at high risk for influenza complications, and to measure the effects of point-of-care education on vaccine acceptance. Separate measurements included average ED length of stay and the study's impact on how quickly the base population could be vaccinated., Results: The effort was determined no longer feasible on November 20, 2020 because of the significant barriers. Although no data were gathered, we were able to glean important information that is vital in future efforts to implement ED-based vaccination programs. Reasons for program failure were multi-factorial, but were mainly attributed to rapid implementation, issues with Pyxis ordering and vaccine shipments, and vaccine storage capacity. The program also lacked a multidisciplinary implementation team of nurses and technicians, which could have better anticipated critical barriers., Conclusion: Influenza has caused multiple worldwide pandemics, contributed to countless deaths, and continues to be a challenge. ED-based influenza vaccination programs have been trialed to augment the primary care system in their effort to prevent deaths from influenza. The literature has shown that these programs are cost-effective and efficacious, but significant barriers have stunted their widespread utilization. Examining the rapid implementation and failure of this program highlights the importance of implementation models, process and barrier mapping, and proper operationalization. It is also the first such program that has been trialed in a military treatment facility. In consideration of the recent pandemic, successful ED-based vaccination programs can also offer a model for additional dissemination of other vaccines, such as the COVID-19 vaccine., (© The Association of Military Surgeons of the United States 2022. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)