Everybody who could afford it adopted psychostimulants in WW2. Go pills have been part and parcel since then. Some countries have adopted modafinil, but the US still uses amphetamine.
I am not sure if that's still the case, but "go pills," Dexedrine, were certainly used in Afghanistan. Here was a horrible potential side-effect:
https://www.cbc.ca/news2/background/friendlyfire/gopills.htm...
I am an adult with ADHD and have never been able to get past the side effects that I have to drugs such as amphetamines and SSRIs. I was prescribed Modafinil for a short period for "Shift Work Disorder" when I worked shift work as a Stationary Engineer and it was glorious in regard to my ADHD symptoms with effectively zero side effects. I wish the US would expand its usage.