This call sign is a reminder of my Navy experience from 1966 to 1970.
I chose
N4NSS for that reason. I was stationed at Skaggs Island, CA. (NPG)
after two years on a technical research ship the USS Oxford AGTR-1 (NSSS).
Additional Ox info.

Finally at Imperial Beach, CA.
NPL receiver site, FRD-10 Wullenweber array used by both NAVSECGRU and COMMSTA.

Below are some links that will take you to some very interesting history.

NSS Annapolis

Naval Radio Transmitting Facility, Annapolis (NSS)

Naval Radio Transmitter Facility Annapolis Naval Station, North Severn, Annapolis MD

Naval Radio Transmitting Facility Tour

Naval Security Station Washington D.C.

US Navy Communication Stations

USN CDAAs End of an Era

Navy CT History

Naval Security Group Command

Homested, Florida

NAVSECGRU Stations Past and Present

The ALL CT Service Roster

Winter Harbor NSGA - 1

Winter Harbor NSGA - 2

Skaggs Island Naval Security Group Activity, CA

Skaggs Island Ham Shack--W6KMW Ham Shack/Antenna 1953-1954

W6KMW ... Skaggs Island, California

NCTC Corry Field, Pensacola, FL (circa 1966-1967) WA4ECY Ham Shack