Friendly fire (shooting/shelling friendly forces) is actually a big problem up to this day. [Pat Tillman](https://en.m.wikipedia.org/wiki/Pat_Tillman) is a modern example that got a lot of attention.
We’re pretty good about not firing on friendly vehicles and aircraft since they look different, but positively identifying foot soldiers at distance (especially ones who don’t want to be seen) is hard.
It doesn’t seem like it should be that hard with modern optics and remote sensing technology, but one thing movies don’t convey about war is just how confusing it is. Everyone is scared and jumpy, and also often exhausted. The noise doesn’t help either, regular guns are like tiny firecrackers compared to artillery and bombs.
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