MCO 6100.12 said:2201. ALTITUDE 3.0 MILE RUN. Marines permanently assigned or on TAD to locations at or above 4500 feet above sea level will have adjusted run times. The altitude 3.0 mile run point values are contained in appendix H. Commands are directed to provide newly joined Marines a 30-day acclimation period prior to conducting a semi-annual PFT. Marines scheduled to report to a command at altitude in June or December will complete their PFTs prior to reporting.
Marine Corps Orders say the darnedest things.
Appendix H lists the perfect score for a high altitude run time for males at 19:30.