FormerRecruitingGuru
Making Recruiting Great Again
I'm unsure of what you're insinuating here.
I misread your post. I thought you already rolled in and have concerns about an earlier class.
Going back to your actual question: it could or could not happen. Folks have no obligation to back out of an OCS date or they get injured / in trouble which requires them to roll back to a later date while it gets resolved.
If there’s an earlier spot for you, your recruiter will let you know soonest.