“Purge”. No
Class sizes get smaller (or larger in that class year ) for many reasons.
There we’re a number of Cadets in DS 21 class that got separated after Christmas break Yuk year. It happens, but the Cadets are the ones who put themselves in that position, it isn’t WP thinning the herd. Some Cadets also may wish to leave before affirmation.
If a Cadet stays out of trouble, seeks AI if struggling academically, is in good standing physically and militarily, and otherwise doing all they can to “make it” , but is still deficient in some area, you will likely be put on probation. You will report to a review board.
There is a reason for a review board. It’s for them to determine if you’re doing all of the above and have a strong desire to be there and graduate. If all of that is determined, and they feel you will be able to graduate, they will likely set a path to meet all requirements for graduation which could include some summer block commitments, ie: tutoring,STAP, extra PT, etc. depending on where you’re deficiency lies. One could also be a December grad or a one year turn back if time is needed.
Disciplinary action could also include “more time “ behind the wall if they still want you to continue and graduate.
The overall number of Cadets at an SA is determined by Congress, and typically adjustments to stay close to that number are made with the incoming class size.