`  == ``Old Corps`` run versus the current run ==  A brief timeline of the MCOs that define the PFT: * MCO 6100.13 (08 Aug 2008) cancelled MCO 6100.12 * MCO 6100.12 (10 May 2002) cancelled MCO 6100.3J * MCO 6100.3J (28 Feb 1988) cancelled MCO 6100.3H  I was only able to locate the documents for MCOs going back to MCO 6100.3J , and that MCO also has the verbiage ``over reasonably level ground`` for the run.  MCOs prior to a certain date appear to be scarce online.  MCO 6100.3H was published on 23-Oct-1980, as per Navy report 87-26   It would seem that the ``Old Corps`` style run would either be defined in MCO 6100.3H or else in an older MCO that was cancelled on or before 23-Oct-1980.    `