In the 1970s there was a revolution in shoulder-launched missiles to kill tanks and planes. Today, the breakthrough lies in small unmanned systems — miniature drones in the near term, but ground robots further out — that can carry sensors and weapons for the infantry.
Every Marine infantry squad will have its own drone and its own unmanned/electronic systems specialist.
There are Top gun simulators for pilots but not for soldiers.
There will be new soldier training simulators at every level from specialized training centers to individual units at their home bases. While training in the field is still vital, it’s limited by its expense, the time it takes to set up, and the physical terrain.