All A-12, YF-12 and SR-71 pilots and RSO's have a check ride number denoting when they were checked out on the aircraft. Numbers run from 1 to 466. Numbers 35 to 100 were not used as 000 to 100 were allocated to the CIA "Oxcart" program, some of which were not used prior to program termination. "Senior Crown" were allocated 101 onwards. All Jack has to do is tell us his check ride number, it must be >35 and <101, or >466.