Theyve changed immeasurably. There hasn’t been another world war because to have another one would almost certainly mean everyone loses.
The tactics can be boiled down to “if they fire nukes, fire our nukes. If it looks like we might lose, fire our nukes”. Nuclear armageddon is the end result, so no nuclear powers want any kind of direct conflict with eachother. Proxy wars and information wars are the new conventional war
Night does not stop operations. Some level of night vision capability is common and tasks whether logistical or tactical continue apace. While everyone needs rest, there is no longer an assumption that night brings safety or concealment. For those without, just because you can’t see, didn’t mean someone can’t see *you*.
Information and precision. Modern commanders have a lot more information flowing in from the front lines and you can do a lot more with fewer munitions now than you could in ww2. Smart bombs and artillery rounds can strike a target with pinpoint accuracy. Modern war has the potential to be much more lethal
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