We are training to go to war but the reality is probably very different to a training establishment.
(Not a naysaying, as a heads up) Thinking that's something that's natural though, the shock just doesn't lessen being thrown into the actual situations.
Different culture and experience here, but basically I've heard so many stories and what to do's and what to not do's growing up but then middle of the night in the bushes everything was just entirely different & that war looked different from everything I've been hearing from the ones fought before, even though the settings were the same / area, power cliques dynamics / basic objectives.
I think a preparation desensitization may be difficult to do. (& I imagine may vary depending on the type of war, but cruelty is difficult enough, so is powerlessness. One may expect and prepare for chaotic situations but then they are just the same batshit insane and there's something that's unprepared for.)