Should I consider my civil service pension an RMD? Is is entirely, partially or not at all an RMD, Office of per Mngmt not disclosed this information to me?

No, do not call it an RMD.   Normally, you would say YES to that question, but in 2020, RMDs were waived, so no distributions were actually RMDs.    So, for this tax return only, answer NO to the RMD question.