What is Retired Reserve?
Retired Reserve meaning in Military terminology / glossary / dictionary is:
All reserve members who receive retirement pay on the basis of their active duty and/or reserve service; those members who are otherwise eligible for retirement pay but have not reached age 60 and who have not elected discharge and are not voluntary members of the Ready Reserve or Standby Reserve. See also active duty; Ready Reserve; Standby Reserve.
Source: JP 4-05