Was he in the Naval Reserves at that time?
Yes......until 1978 I understand.
From "Unfit for Command" p 199:
January 3, 1970 Status changes from "active" duty to "inactive" duty in the Naval Reserves
...
July 1, 1972 Transferred to Standby Reserve, "inactive"
This is the last entry. I have seen reports on FR that his final release from the Reserves didn't occur until sometime in 1978.