I've HEARD (don't know if it's true... but it makes perfect sense) that for some missions, some Soldiers are issued Dexadrine (or some other kind of "upper") to be used to maintain mental alertness until a long mission is over.
I know that the Apollo astronauts had Dexadrine in their medkits, and I read a long time ago that some mission (to Libya I think) there were two fighter planes and one lost electrical power and the other plane did a fuel dump to light a giant flare to give the first plane a heading. In that article they mentioned that due to the length of the mission they used "speeders" of some sort to stay alert and finish the mission.
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