ET(N)-3 (SS), Navigation ET (3339) - LORAN-C; NAVSAT/BRN-3 and various miscellaneous time standards and time keeping devices.
First off, nice website. Well done!
I was the classic underachiever of the vaunted "Silent Service"--drafted in 1967; I ran for the Navy/Air Force and a field that would keep me away from SE Asia. I was lucky to find the US Navy and made nine (9) deterrent patrols and then got out. I did my job well and somewhat enjoyed it, but "making rate" wasn't my top priority. What they taught me was put to use in the 80s, 90s, 2000s building computer networks LANs, WANs, MANs, et. al.
Along the way, TAGS ships and their missions were often discussed among us NavCenter watch standers during the seemingly endless hours of making sure our SINS didn't run off the plot page and we could meet the position requirements of the next WSRT. We marveled at how much accuracy and detail the systems that we ran (and y'all made possible and viable) were. I ran into one TAGS sailor in New London during some refresher training and his description of your mission made me wish I'd been assigned to a TAGS ship instead of a submarine... oh well.
Thank you for the website. A fun trip down memory lane from a user and benefactor of your efforts.