The fact that women are “finally” beating men in those extreme endurance contests is more likely to have more to do with the fact that by far the majority of the contestants are men.
With the elite military forces (Navy Seals, British SAS, and similar), the selection processes are as much about physical strength as anything else. For example, potential SAS recruits are set off on a forced march through the Brecon Beacons, whilst loaded down with 100 kg of equipment (ie 220 pounds, which is considered a fair load for a mule or packhorse). The time limit imposed necessitates that they maintain at least a slow run over the entire distance. It is easily explained why no women soldiers have ever passed the SAS selection process, and it is all about strength, not stamina.