Bohemia Interactive Simulations (BISim), a subsidiary of BAE Systems, is a global software company specializing in simulation training solutions for defense and civilian organizations. BISim develops high-fidelity, cost-effective simulation software products and components, including their flagship product VBS4, a comprehensive virtual desktop training environment with whole-earth rendering, and Blue IG, that provides high-fidelity and high-performance rendering from space down to blades of grass.. These products are used for tactical training, experimentation, and mission rehearsal, and can integrate into combat vehicles, aircraft, and virtual sand tables. BISim partners with organizations like the U.S. Army Futures Command and Varjo, delivering advanced simulations to over 60 militaries and 300 industry partners worldwide.
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OneArc is a BAE Systems business unit that launched in December 2025 to consolidate Bohemia Interactive Simulations, TerraSim, and Pitch Technologies.