NSGD Groton Established, January 1959

In January, 1959, the Naval Security Group Detachment (NSGD), Groton was established. Ten months later, in October, the Naval Security Group designated its first Special Assistant for Naval Security Group matters and assigned him additional duty as Officer in Charge, Naval Security Group Detachment, Commander Submarine Force, U.S. Atlantic Fleet.


One year later, the Chief of Naval Operations designated that position as Officer in Charge, Naval Detachment and Director of Intelligence Special Security Officer for Deputy Commander Submarine Force, U.S. Atlantic Fleet.

In October 1972, the Detachment was designated Naval Security Group Detachment Groton under the command of Commander, Naval Security Group Command. The Detachment was commissioned a Naval Security Group Activity (NSGA) on May 1, 1980. The official recommissioning date recorded in NAVSECGRU records was October, 1, 1980. NSGA Groton was re-established as NSG Detachment Groton in July, 2005.