The way I see it, virtual reality for military applications has a ceiling in so far as cost saving vs actual hands on. Simulating reality can’t reproduce the hazards of that reality in quite the same way. Obviously “in the field” training is where you want to be with military personnel.
Aplications for VR that would make sence to me would be medical or robotics, or even better, augmented reality in these areas.
As far as games go the level of fidelity leaves much to be desired with the current generation of head sets/ computers available to the consumer.
The technology has a long way to go.