According to the military, that isn't the problem. Apparently the current generation is more willing to kill than any prior generation that they kept records for... WW1's generation had a really hard time actually intentionally shooting someone.
Even up to Vietnam it was quite common for US soldiers to intentionally miss.
The military is saying the problem is not that people are sissies so much as they're fat and weak. So they've shifted a lot of the training from bits where they key up people's killer instincts and instead spend that time running laps and doing push ups.
I can send you reports from the marines and army. They're very happy with the "grit" of the men showing up to serve. They're just annoyed out how out of shape they are.
If the military requires drone pilots then the requirement for fitness in military service drops a lot. Which helps the USA a lot because the majority of 'Murcans are not fit for military service at all.
Just set the flabby fatty 'Murcan in the chair in front of the drone controls and let them murder as many people as they like cos they LOVE killing.