Well, prior to 2016, you had to be within height / weight standards or pass a rope and choke with 22% / 30% bodyfat for men / women. So reasonably, you're pushing it if you have about a 36-38" / 32-34" waist... provided the test was administered properly.
Then we said screw that noise, we'll go to a flat 39" / 35.5" waist.
Then SECDEF said that the Navy is too fat and we need to fix ourselves by going back to the standards of 1992.
So we came up with an over complicated system that allows you to have a waist well in excess of 40" and pass, albeit you will be on mandatory FEP, because the cut line is now 26% bodyfat for men and 36% bodyfat for women.