A deep, independent examination of the U.S. military training and battlefield simulation ecosystem, analyzing I-MILES, Saab GAMER, Rheinmetall LEGATUS, Lockheed Martin SIMRES, Cubic I-HITS, and Zen Technologies TacSim across product architecture, engineering, interoperability, trust, procurement, lifecycle economics, and strategic fit. The dossier asks a critical question: Which architecture provides the strongest foundation for trusted, scalable, interoperable, and continuously evolving military training? Its central finding is that future advantage may increasingly depend on the “trust layer” — the ability to capture battlefield events, preserve provenance, establish confidence, reconstruct what happened, and convert training data into measurable learning. The research also presents a 2030 training-system reference architecture, regional perspectives across the United States, Europe, India, GCC, and Africa, a procurement-grade decision framework, and strategic opportunities for technology companies and startups. Defense by Luke™ conclusion: The real competitive question is not simply fidelity. It is trust.