What works for the CFA and what is needed to be successful at USNA aren't the same thing. Seriously.
The CFA is a lengthy test where they recognize that you're tired out. It's also more of a "minimum standard" approach -- the fact you pass the CFA does not mean that you're in shape for plebe summer.
For CFA purposes, males are probably OK if they are sub 7:00 and females if they're sub 8:00. Not saying that a slower time won't be ok (although not much slower) and faster times are clearly better.
For USNA purposes, males should be able to run at no slower than a 6:30 pace over 1.5 miles (passing is a BIT slower) and females no slower than a 7:30 pace over 1.5 miles. You're MUCH better off if you're in the 6:00/7:00 range. AND, for plebe summer, you should be able to run 3-4 miles at a 6:30/7:30 pace.
The above will make your life a LOT easier. Folks who are slower (and I was one of them) will struggle and you don't want to struggle.