Computer and other simulator system has been used for a long time to train military personnel because it is a lot cheaper. Here is a video of training with TOW and Javelin that use the real control system but what you see is computer generated [https://www.youtube.com/watch?v=plrYVkZsWp4](https://www.youtube.com/watch?v=plrYVkZsWp4)
It is not just something done today, there was film based simulator for airplane crew in WWII [https://stock.periscopefilm.com/86084-wwii-gunnery-simulator-film-loop-army-air-forces-tail-gunner-waller-trainer/](https://stock.periscopefilm.com/86084-wwii-gunnery-simulator-film-loop-army-air-forces-tail-gunner-waller-trainer/)
Weapons are used in practice too, if you fire real weapons it will be again dummy targets. Dummy ammunition agains real tanks is another possibility.
You can alos replace the projeticle with another that preformt he same way. This is the trainer weapon for the AT4 that fire a 9mm tracer bullet with the same ballistic properties. [https://www.youtube.com/watch?v=FHmra84GsyA](https://www.youtube.com/watch?v=FHmra84GsyA)
If you look back at for example recoiless rifles it was not uncommon to have a sitting rifle in them with the same ballistic properties that you fire first to get the aim right. You can just practice with them, I am not use how good they was at hitting moving target to begin with.
There are laser simulation system like [MILES](https://en.wikipedia.org/wiki/Multiple_integrated_laser_engagement_system) that are used in mock combat with blank cartides and laser. The target have receives and can detect if they are hit. This exist from west and adapters on guns for individual soilder to system in tanks. This is lass about how you initially train to hit a target and more how you should act together and a unit to engage the enemy.
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