In 2011, a Virginia-based IT company called Intelligent Decisions developed a simulation system for the US military that would help prepare soldiers for combat. The system, called the Dismounted Soldier Training System or DSTS, used a head-mounted display and a laptop worn inside a military backpack to immerse soldiers in a virtual learning environment similar to a military video game. Now that same company is turning its attention to the civilian world with a system it simply calls Medical Simulation. And the company says it might soon help train healthcare professionals for difficult surgeries, disaster response, and could even be used to treat people who suffer from PTSD. Medical Simulation could recreate the Boston Marathon bombing