Form my experience so far:
1) German Observers cannot order artillery missions beyond 1000 meters - (Observation based on Al Bab mission of German Campaign. Not sure if it applies to all spotters)
2) US soldiers tend to overuse handguns in close quarters instead of assault rifles.
3) Syrians tend to abandon positions in buildings and run into the open if they are hit by artillery or HE or high caliber (over 20mm) fire. This is pure stupidity as it makes them much mover vulnerable.