Just a side note:
The ability to do multiple pull-ups sometimes has little to do with carrying heavy loads. I have seen big strong guys who could barely do one pull-up...or climb a rope on the obstacle course, but you know they could easily carry someone.
And then there are the light skinny people who can do lots of pull-ups, but cannot carry much.
That being said, everybody in the military should be able to do at least 3 pull-ups.
No kidding, I am 52 and have not worked out in 10 years and I could do 3 pull ups. Heck I could do 25 when I was in 7th grade. What is wrong with these people?
The thing about pull ups is you need to train to do them. Any man or woman that can't do 3 after some training is either physically impaired or hopelessly lazy.