“Today, at my direction, every member of the joint force, at every rank, is required to take a PT test twice a year, as well as meet height and weight requirements twice a year, every year of service,” he said.
So he's going to use the BMI to tell whether someone is obese or not. BMI is great for statistics, but terrible for assessing individuals. A lot of military guys do bodybuilding and would be assessed as "obese" by the BMI even though they are fitter than most.
For example: I work out, have no visible fat, can run 10k under 50 minutes and still fall right into the "overweight" category because I lift weights. And I don't even consider myself particularly big.