Waiving some of the rejection requirements doesn't help. Most of those enlisted below standards don't make it past the first year.
The U.S. Army is trying a 90-day pre boot camp training program.[1] There are two tracks, one for the fat ones, and one for the uneducated ones. The educational track focuses on word knowledge, paragraph comprehension, and arithmetic reasoning. Enough practical literacy to follow the simpler Army field manuals. The fat track has the troops on this track losing 1 to 2% body fat per month. Those who can't meet the minimal standards for enlistment in 90 days are released.