From the ArmyTimes:

According to the latest Pentagon figures, a full 35 percent, or more than one-third, of the roughly 31.2 million Americans aged 17 to 24 are unqualified for military service because of physical and medical issues. And, said Curt Gilroy, the Pentagon’s director of accessions, “the major component of this is obesity. We have an obesity crisis in the country. There’s no question about it.”

Full Article – HERE

So, since that established that not everyone can do the job… WHY are the guys that are doing it, not getting paid more?