List of drugs used by militaries

Various drugs have been or are being used by militaries worldwide. Such drugs may improve performance of soldiers by suppressing hunger, increasing wakefulness and concentration, suppressing fear, reducing empathy, improving reflexes and memory-recall among other things.

For drugs that are currently or recently being used by militaries.
Administration tends to include strict medical supervision and prior briefing of the medical risks.
Caffeine, diet pills, painkillers and alcohol are not featured in the list, neither is non-administrated, illegal usage.

...
Wikipedia