I've used FPS' as a training aid and I think it works very well for teaching convoy operations. It does not work as well dismounted for a variety of reasons.
But if you want to practice sectors of fire, checkpoints and radio procedures it works well at a fraction of the cost of getting everyone into a vehicle, which is what I'm told they used to do.
Now, if you want to look at JCATs, that system takes it to a whole new level. We could stand to double down and use more of that.
Bookmarks