Here's my thought, though I should preface it by offering that I've not served. Also, that I do agree that there are very likely duties that must be staffed appropriately, and for some, the top 1 - 0.5% of physically able men should probably be doing them, in the name of efficiency, expediency, and timeliness. However, I also believe that, due to the wide variety of responsibilities that I'm certain must exist within the Military in General, there must be some to which women are better suited in terms of their own abilities.
Thus, for the sake of general efficiency, it would be in the best interest to the overall success of the military to attempt to make the testing for those instances relevant and suitable.