What grade reduction cannot be imposed on personnel in paygrade E-4 and above?

The imposition of correctional custody does not result in a grade reduction for personnel in paygrade E-4 and above. Correctional custody is a form of non-judicial punishment aimed at addressing misconduct by restricting a service member's privileges or imposing extra duties, but it does not affect their rank or paygrade. In the military, administrative reductions, reductions in grade, and disciplinary actions can all lead to a downgrade in rank, making correctional custody the one option that serves a different purpose without impacting rank.

This distinction is crucial for understanding the boundaries between various punitive measures and their implications on a service member’s career status. Personnel in E-4 and above still retain their rank while serving correctional custody, although it may entail other restrictions or consequences as part of their punishment.