Agreed that cardio is important, but it's not the end all be all. I know "every Marine a rifleman" but that's junk pogs tell themselves. Your 0311s will have better fitness than pogs and that's true in basically all branches.
This isn't directed at you specifically, more the running is the most important camp.
Combat fitness doesn't care about your 2/3 mile, push ups, whatever. You've got to be able to make movements and not be so smoked that you can't effectively fight once you're there.
If you can run well, then you can probably ruck but only if your build is not that of a typical distance runner. The really scrawny guys that can also ruck with (60+ lbs) combat loads are few and far between.
Think about it, if you're 130 lbs, how well are you going to be able to move with 60lbs+ of gear with you? PT test are outdated, sure but it's hard to get a great model that fits everyone. Combat doesn't have sliding standards and some guy isn't going to weigh less because you're a female.
A bit off topic, but I'm curious to hear people's perspectives on the different scales for women while allowing them into combat roles.
It's not unlike coaching, one program may work well for a certain discipline, but not well for others. I personally believe that for combat roles if you're scoring 270+ on pt tests, then your overall fitness is satisfactory. For support people, I don't know that their fitness is overly important aside from the discipline aspect.