Americans are more and more averse to going to war, which is why the USA is sending drones instead of people now. The situation is similar in Europe. Not so much in the other parts of the world, though.
A reasonable explanation could be proximity: When the war takes place in their own country, people are more likely to pick up guns instead of waiting for drones to be sent.
A reasonable explanation could be proximity: When the war takes place in their own country, people are more likely to pick up guns instead of waiting for drones to be sent.