I think many of the services still have training fitness requirements close to whats necessary,yes some specifically the army haved toned down,a part of thats societies fault in the thirties,forties and fifties you still had many guys used to living on the smell of an oily rag,chopped their own wood,worked in foundries as vs press buttons etc,people hard enough you can relatively quickly introduce to a pretty tough regimen,now you have to be introduced to what the body is capable of first,then take it from there,to possibly within striking range of what your talking about.
Its keeping them there thats the problem,its the fact one year later your allowed to have a big gut thats the problem.As for women well in certain roles the Vietnamese and Russians both used them effectively,albeit the second in context of a meatgrinder as for common grunt; not unless their name is Bev Francis and they can carry 220lb deadweight over undulating terrain and look like a male.
Sir, I have a grand-daughter in the Marines.
No brag, just fact when I say that she beat the snot out of every female and a few of the "men" presented in the "one-on-one" exercises.
She is no lesbo-on-steriods butchy.
What she did not do is sit on her butt, eating fries, burgers and pizza in front of the TV.
What she did do is hit the surf, jog, enjoy physical activities that would make the urban gang boys sick from over-exertion.
I still do not think women should be in the armed forces front lines (even though she is also more than a "pretty good shot").