[atomic_dog]

In many publications, in the early to mid-70's the USN was using SS(N). The designation cab be seen in many articles at the Naval History and Heritage Center www.history.navy.mil

Graduate of Nuclear Power School in Bainbridge, MD 1975.

[TexasGator]

“Naval History and Heritage Center www.history.navy.mil”

——————————SSN———————
https://www.history.navy.mil/content/history/nhhc/search.html?q=Nautilus

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“Graduate of Nuclear Power School in Bainbridge, MD 1975.”

Class 69-3. S1C, SSN, CVAN

[TexasGator]

“In many publications, in the early to mid-70’s the USN was using SS(N). “

My 1972 sub quality certificate has SSN.

My 1974 EM1 promotion letter has SSN.

[TexasGator]

Correction

My 1973 EM1 promotion letter has SSN.