The Cessna T-37B as freeware is also a remarkable aircraft in its own right. Downloaded today and read a lot of good things. But the civil jets can be used anywhere, while with military jets you have fewer options if you want to "do it right". An example. Now with an Easter discount there was and is the MiG 21bis (So writes not "Mig", because it comes from the two first designers of the design bureau Mikoyan and Guryevich)
The publishers of the add-on have thought along. They have also included the livery of the Romanian Air Force, after 1990 in the NATO. So with reason you can fly it anywhere in NATO countries. For example, they were traveling up in the Baltic States.
With civilians you don't have to think about it, even if a Syrian business jet shows up over say Afghanistan it's not unthinkable.