@kdfrawg Well, depends on the military: https://yle.fi/uutiset/osasto/news/finnishdefenceforcesinvest3millioninvideogamesforvirtualcombattraining/9826976 (this news was released today, quite conveniently for this conversation)
TL;DR: The game the Finnish Defence Forces use is based on a commercial game. Only camouflaging and weaponry has been replaced with what the FDF uses.
// @hybotics