In-flight Stimulants are consumable items used to provide a similar role to caffeine, taurine or any other stimulant - Increased mental awareness. This is necessary in order to bring reaction times into usable territories for soldiers jumping out of Sky Cranes, as misjudging the time to activate leaves the soldier floating down too slowly, or slamming in too hard; both scenarios leaving him vulnerable to enemy fire.

Alex Corde mentions the In-flight stims have an unintended effect on him: they cause him to flashback to his childhood. Presumably, this doesn't have negative consequences for him, as he seems to burn in fine regardless of the mild side effect.

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