This makes no sense. Ask yourself why men and women don't compete against each other in track and field events, in tennis, in gymnastics, or in most sports. It's because there ARE certain physical differences in certain disciplines that make men perform better than women -- generally those requiring speed and strength.
The question is whether you are measuring fitness or setting standards to complete a task/job. If you are measuring fitness, some standards should differ because a fit male is faster and stronger than a similarly fit female. If you hold men and women to the "same" standards in, for example, a run, you are asking the woman to be more fit. If you don't believe me, see above -- men and women in the Olympics are equally fit but don't compete against each other in the 100m dash or the marathon or the shot-put . . .
If the purpose is to ensure military personnel can accomplish a task (e.g., SEALs), then a single standard is absolutely the right way to go.
Service Academy standards are about measuring fitness; thus there should be differences in the standards to reflect reality. The proper "difference" between requirements for males and females is something best left to the experts. But any guy who thinks a female who runs 1.5 miles in the same time he does is demonstrating she is as fit as him is nuts -- she is clearly in much better shape.
Is it fair that women achieve a higher standard than males?