BACKGROUND: Simulation-based medical training has been shown to be effective and is widely used in civilian hospitals; however, it is unclear how widely and how effectively simulation is utilized in the U.S. Military Health System (MHS). The current operational state of medical simulation in the MHS is unknown, and there remains a need for a system-wide assessment of whether and how the advances in simulation-based medical training are employed to meet the evolving needs of the present-day warfighter. Understanding the types of skills and methods used within simulation programs across the enterprise is important data for leaders as they plan for the future in terms of curriculum development and the investment of resources. The aim of the present study is to survey MHS simulation programs in order to determine the prevalence of skills taught, the types of learners served, and the most common methodologies employed in this worldwide health care system.
METHODS: A cross-sectional survey of simulation activities was distributed to the medical directors of all 93 simulation programs in the MHS. The survey was developed by the authors based on lists of critical wartime skills published by the medical departments of the US Army, Navy, and Air Force. Respondents were asked to indicate the types of learners trained at their program, which of the 82 unique skills included in the survey are trained at their site, and for each skill the modalities of simulation used, i.e., mannequin, standardized patients, part task trainers, augmented/virtual reality tools, or cadaver/live tissue.
RESULTS: Complete survey responses were obtained from 75 of the 93 (80%) MHS medical simulation training programs. Across all skills included in the survey, those most commonly taught belonged predominantly to the categories of medic skills and nursing skills. Across all sites, the most common category of learner was the medic/corpsman (95% of sites), followed by nurses (87%), physicians (83%), non-medical combat lifesavers (59%), and others (28%) that included on-base first responders, law enforcement, fire fighters, and civilians. The skills training offered by programs included most commonly the tasks associated with medics/corpsmen (97%) followed by nursing (81%), advanced provider (77%), and General Medical Officer (GMO) skills (47%).
CONCLUSIONS: The survey demonstrated that the most common skills taught were all related to point of injury combat casualty care and addressed the most common causes of death on the battlefield. The availability of training in medic skills, nursing skills, and advanced provider skills were similar in small, medium, and large programs. However, medium and small programs were less likely to deliver training for advanced providers and GMOs compared to larger programs. Overall, this study found that simulation-based medical training in the MHS is focused on medic and nursing skills, and that large programs are more likely to offer training for advanced providers and GMOs. Potential gaps in the availability of existing training are identified as over 50% of skills included in the nursing, advanced provider, and GMO skill categories are not covered by at least 80% of sites serving those learners.

BACKGROUND: Advancements in information technology have facilitated information exchange practices within the Military Health System (MHS), enabling \"systems of systems\" approaches that broaden and coordinate the set of capabilities available to enhance patient outcomes. This is applicable for MHS modeling and simulation (M&S) applications as well. Learning from successful approaches applied in current interoperability solutions used in the military helps to ensure interoperability practices yield trusted compositions of simulations.
METHODS: The use of formal methods provides the rigor necessary to unambiguously communicate these approaches across the MHS community. Here, 3 formal methods are proposed to ensure the harmonization of models and alignment of M&S data needed for simulation interoperability for MHS applications.
RESULTS: To clarify considerations relevant for establishing simulation interoperability, the proposed formal methods are examined within a notional example of an injury sustained because of blast exposure. The first method applies the principles of semiotics, addressing the coding of information via syntax and semantics, to understand how to align and transform data across simulations within a composition. The second method applies the concepts of well-specified co-simulations, and the use of different techniques, tools, and algorithms to address the composition and synchronization of M&S components. The third method applies the mathematical branch of model theory to codify expert knowledge about concepts, assumptions, and constraints to ensure conceptual alignment within the simulation composition.
CONCLUSIONS: Biomedical research must contend with complexity inherent to computational human body modeling, enlisting expert knowledge from multiple domains supporting the development of cross-disciplinary research tools that resolve research foci and associated differences in underlying theories, methods, and applied tools. This is closely related to the broader context of digital engineering for military systems engineering.

BACKGROUND: The coronavirus disease 2019 (COVID-19) pandemic caused significant global disruptions to the healthcare system, which was forced to make rapid changes in healthcare delivery. The pandemic necessitated closer collaboration between the US civilian healthcare sector and the military health system (MHS), resulting in new and strengthened partnerships that can ultimately benefit public health and healthcare for the nation. In this study, we sought to understand the full range of partnerships in which the MHS engaged with the civilian sector during the COVID-19 pandemic and to elicit lessons for the future.
METHODS: We conducted key informant interviews with MHS policymakers and advisers, program managers and providers who were affiliated with the MHS from March 2020 through December 2022. Key themes were derived using thematic analysis and open coding methods.
RESULTS: We conducted 28 interviews between December 2022 and March 2023. During the pandemic, the MHS collaborated with federal and local healthcare authorities and private sector entities through endeavours such as Operation Warp Speed. Lessons and recommendations for future pandemics were also identified, including investment in biosurveillance systems and integration of behavioural and social sciences.
CONCLUSIONS: The MHS rapidly established and fostered key partnerships with the public and private sectors during the COVID-19 pandemic. The pandemic experience showed that while the MHS is a useful resource for the nation, it also benefits from partnering with a variety of organizations, agencies and private companies. Continuing to develop these partnerships will be crucial for coordinated, effective responses to future pandemics.

The Military Health System (MHS) is a global, integrated health delivery system tasked with ensuring the medical readiness of the U.S. Armed Forces while fulfilling the individual health care needs of eligible military personnel and their dependents. The MHS network comprises military hospitals and clinics that ensure the medical readiness of the force, which are complemented by programs that enable beneficiary care in the private sector through the TRICARE insurance program. Mental health disorders accounted for the largest proportions of the morbidity and health care burdens that affected the pediatric and younger adult beneficiary age groups of nonservice member beneficiaries of the Military Health System in 2023. Among adults aged 45-64 years and adults aged 65 years and older, musculoskeletal diseases accounted for the most morbidity and health care burdens. With almost all health care for Medicare-eligible beneficiaries aged 65 years and older at private sector medical facilities, over 91% of health care encounters among non-service member beneficiaries (TRICARE-eligible and Medicare-eligible) occurred at non-military medical facilities.

This retrospective observational study investigates skin cancer prevalence and care patterns within the Military Health System (MHS) from 2017 to 2022. Utilizing the MHS Management Analysis and Reporting Tool (most commonly called M2), we analyzed more than 5 million patient encounters and documented skin cancer prevalence in the MHS beneficiary population utilizing available demographic data. Notable findings included an increased prevalence of skin cancer in the military population compared with the civilian population, a substantial decline in direct care (DC) visits at military treatment facilities compared with civilian purchased care (PC) visits, and a decreased total number of visits during COVID-19 restrictions.

OBJECTIVE: Although studies have described inequities in spinal cord stimulation (SCS) receipt, there is a lack of information to inform system-level changes to support health care equity. This study evaluated whether Black patients exhaust more treatment options than do White patients, before receiving SCS.
METHODS: This retrospective cohort study included claims data of Black and non-Latinx White patients who were active-duty service members or military retirees who received a persistent spinal pain syndrome (PSPS) diagnosis associated with back surgery within the US Military Health System, January 2017 to January 2020 (N = 8753). A generalized linear model examined predictors of SCS receipt within two years of diagnosis, including the interaction between race and number of pain-treatment types received.
RESULTS: In the generalized linear model, Black patients (10.3% [8.7%, 12.0%]) were less likely to receive SCS than were White patients (13.6% [12.7%, 14.6%]) The interaction term was significant; White patients who received zero to three different types of treatments were more likely to receive SCS than were Black patients who received zero to three treatments, whereas Black and White patients who received >three treatments had similar likelihoods of receiving a SCS.
CONCLUSIONS: In a health care system with intended universal access, White patients diagnosed with PSPS tried fewer treatment types before receiving SCS, whereas the number of treatment types tried was not significantly related to SCS receipt in Black patients. Overall, Black patients received SCS less often than did White patients. Findings indicate the need for structured referral pathways, provider evaluation on equity metrics, and top-down support.

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BACKGROUND: The global burden of trauma disproportionately affects low-income countries and middle-income countries (LMIC), with variability in trauma systems between countries. Military and civilian healthcare systems have a shared interest in building trauma capacity for use during peace and war. However, in LMICs it is largely unknown if and how these entities work together. Understanding the successful integration of these systems can inform partnerships that can strengthen trauma care. This scoping review aims to identify examples of military-civilian trauma systems integration and describe the methods, domains, and indicators associated with integration including barriers and facilitators.
METHODS: A scoping review of all appropriate databases was performed to identify papers with evidence of military and civilian trauma systems integration. After manuscripts were selected for inclusion, relevant data was extracted and coded into methods of integration, domains of integration, and collected information regarding indicators of integration, which were further categorized into facilitators or barriers.
RESULTS: Seventy-four studies were included with authors from 18 countries describing experiences in 23 countries. There was a predominance of authorship and experiences from High-Income Countries (91.9 and 75.7%, respectively). Five key domains of integration were identified; Academic Integration was the most common (45.9%). Among indicators, the most common facilitator was administrative support and the lack of this was the most common barrier. The most common method of integration was Collaboration (50%).
CONCLUSIONS: Current evidence demonstrates the existence of military and civilian trauma systems integration in several countries. High-income country data dominates the literature, and thus a more robust understanding of trauma systems integration, inclusive of all geographic locations and income statuses, is necessary prior to development of a framework to guide integration. Nonetheless, the facilitators identified in this study describe the factors and environment in which integration is feasible and highlight optimal indicators of entry.

The Department of Defense Global Respiratory Pathogen Surveillance Program conducts continuous surveillance for influenza, severe acute respiratory syndrome 2 (SARS-CoV-2), and other respiratory pathogens at 104 sentinel sites across the globe. These sites submitted 65,475 respiratory specimens for clinical diagnostic testing during the 2021-2022 surveillance season. The predominant influenza strain was influenza A(H3N2) (n=777), of which 99.9% of strains were in clade 3C.2a1b.2a2. A total of 21,466 SARSCoV-2-positive specimens were identified, and 12,225 of the associated viruses were successfully sequenced. The Delta variant predominated at the start of the season, until December 2021, when Omicron became dominant. Most circulating SARS-CoV-2 viruses were subsequently held by Omicron sublineages BA.1, BA.2, and BA.5 during the season. Clinical manifestation, obtained through a self-reported questionnaire, found that cough, sinus congestion, and runny nose complaints were the most common symptoms presenting among all pathogens. Sentinel surveillance can provide useful epidemiological data to supplement other disease monitoring activities, and has become increasingly useful with increasing numbers of individuals utilizing COVID-19 rapid self-test kits and reductions in outpatient visits for routine respiratory testing.

UNASSIGNED: The last 20 years of sustained combat operations during the Global War on Terror generated significant advancements in combat casualty care. Improvements in point-of-injury care, en route care, and forward surgical care appropriately aligned with the survival, evacuation, and return to duty needs of the small-scale unconventional conflict. However, casualty numbers in large-scale combat operations have brought into focus the critical need for modernized casualty receiving and convalescence: Role 4 definitive care. Historically, World War II was the most recent conflict in which the United States fought in multiple operational theaters, with hundreds of thousands of combat casualties returned to the continental United States. These numbers necessitated the establishment of a \"Zone of the Interior,\" which integrated military and civilian health care networks for definitive treatment and rehabilitation of casualties. Current security threats demand refocusing and bolstering the Military Health System\'s definitive care capabilities to maximize its force regeneration capacity in a similar fashion. Medical force generation, medical force sustainment and readiness, and integrated casualty care capabilities are three pillars that must be developed for Military Health System readiness of Role 4 definitive care in future large-scale contingencies against near-peer/peer adversaries.