They give soldiers amphetamines and the like to increase there alertness, could be adderall/ritalin/concerta those type of meds. When ure drunk as fuck and take valium you will usually end up blacking/passing out, (and its a pretty dangerous combo, cuz of the risk of vomite inhalation during sleep) so I don't think ure mates taking that, I fell asleep with my head on my knee for 20 mins while taking a shit in the bathroom on this combination, all I thought I did was close my eyes, and the next time I opened em, I'm staring at my trousers around my ankles, then i further pissed myself with laughter, for the next 10 mins, upon realizing what I'd jus done, longest shit of my life. I enjoy valium, especially with weed, much prefer it over weed and alcohol, makes you feel loose, incredibly relaxed and the heavy bodyload reminded me of shrooms a lil bit, wouldn't go out of my way to get it though.