I even worked with military simulators, and they themselves are segregated. The simpler ones use the "marketing" figures for secret stuff (the thing I specifically remember was range for air-to-air robots and turn capabilities etc), whereas some might use the real figures. I don't think even the most high fidelity simulators always use 100% accurate info, especially when it comes to radar stuff which is very very well guarded. Even though a lot of the code can be identical to the "flying code" for aircraft, there is still a lot of physical stuff that needs to be specifically modelled.