I've seen some remarkable US military medical tech driven by the need to either "repair" or rehabilitate their men. from a country selfish perspective, its far more beneficial to bring that experience back into use, even if its not on the same battlefield, they're fit enough to pass on experience. Countries just can't afford to bleed experience in hi-tech militariesI think one has to remember that when people talk about reducing human casualties they are talking about their own ones and not about enemy ones.
And even this thinking goes out the window in a full all out war for national survival. A society, especially a democratic one, naturally has a lot of problems with sending their young men and women into harms way when the majority of the population is not sure about wether it is worth the casualties or not.
This is the sole reason why relatively small insurgencies can be such a pain in the a** for nominally much more powerfull countries.
In an all out war were things like Stalingrad or D-Day happen the society couldn't care less abouth some few dozen pilots which were saved due to the air force using drones instead of manned planes.
the glaring examples of what the public will accept is one day in the somme - and one day in afghanistan