"Third Monkey" is a code name for a training program developed for the US Army's 18th Airborne Corp. The program was created to meet the Austere Training Requirement, which required soldiers to complete training with limited equipment and space. 

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The program's slogan is, "Never fight until you have to. But when it's time to fight, you fight like you're the third monkey on the ramp to Noah's Ark… and brother, it's startin' to rain!"