ABSTRACT The military simulation domain, particularly in beyond visual range (BVR) air combatscenarios, requires tools that combine high technical fidelity with operational usability. Advanced simulationengines, such as the Aerospace Simulation Environment (ASA), provide significant analytical capabilitiesbut often rely on complex user interfaces, which can hinder the rapid configuration, execution, andassessment of scenarios by analysts and mission planners.At the same time, the evolution of complex and distributed systems, including emerging unmanned trafficmanagement (UTM) ecosystems, highlights a broader and recurring challenge related to the integrationof heterogeneous platforms, data sources, and high-fidelity simulation tools. This context reinforces therelevance of lightweight interaction and visualization layers capable of improving interoperability andsituational awareness, regardless of the specific application domain.In this context, this paper presents the WebStation ASA, a web-based situational awareness platformdeveloped as a lightweight interaction layer over the ASA simulation engine, which is institutionally ownedby the Brazilian Air Force General Staff (EMAER). The article describes the system architecture, functionaland non-functional requirements, design decisions, and technical lessons learned, focusing on how webbased interfaces can improve usability and integration in complex simulation environments.INDEXTERMS Military simulation, Web-based systems, Situational awareness, Simulation architectures,Human–machine interaction, System integration