During WW2, the Nazis supplied uppers (methamphetamines) to their troops.
It was common practice in the US military at least into the 2000s. I would be surprised if that has changed.
January 5, 2006 – U.S. Combat Pilots on Speed – ”...a 20/20 investigation has found, the amphetamines, the speed pills, are now standard issue to U.S. Air Force combat pilots, to help them stay awake on long combat sorties….”