My father was a U.S. Marine back in Vietnam and he said he had to take a similar kind of test. He told some rather entertaining stories about what some guys did in order to FAIL this test. One involved putting the contents of a jar of chunky peanut butter down your pants. When asked about the strange substance during the physical examination, the potential recruit scooped some of it up into his mouth and declaired, "I believe it's sh**, sir". He was denied entrance for "mental reasons". Sorry if that was too racey, but hey, I heard that story from my dad. I tried not to be too graphic about it.