As someone mentioned earlier, not all of todays front line military roles rely more on physical strength alone. Todays military tasks, in the field and elsewhere, differs from the past. However, assessing the suitability of people for military taskings, especially among the sexes, are mired in the past-which assessed people on different physical characteristics, than required in many tasks I today's high tech field of conflict.

Linked is an interesting related background article-if you don't have time fof a full read ( its some 80 +pages) , there is a summary near the end.

Men and women, weight, body fat strength and endurance in military tasks