Graduation requirements fall into two spheres: academic and deportment (behavioral)
Academic is pass/fail in the course work necessary for BS credentials and diploma.
Deportment is behavior related and thus, as is mentioned in the forums numerous times, should be foremost in an applicant's, appointee, basic, Cadet, and finally graduation ready Firstie's mind...there is Never a time when your unwise actions or decisions will not affect your military trajectory!
Suffice it to say in 2 of the circumstances mentioned here that I know of, the Academy is absolutely correct in their decision to withhold.
This is all I will say on the matter.
Usually academic problems result in late grad...however deportment issues can happen right up until the time of Commissioning and in some severe issues affect that very Commissioning.