The following timeline highlights key events spanning 110 years of Commander, Naval Security Group Command / Fleet Cyber Command / Commander, TENTH Fleet history. Please note that not all events are included.


1 February 2025 – The EP-3E officially retired by the U.S. Navy

9 February 2025 – Sgt Jacob Durham, USMC, KIA, Maguindanao del Sur, Philippines

12 June 2025 – NIOC Colorado elevated from an O5 command to an O6 Command when CAPT Hanser assumed command


28 July 2025 – Navy Cyber Warfare Development Group renamed to Navy Cryptologic Warfare Development Group

June 2023 – Maritime Cyber Warfare Officer (1880) designator established.

June 2023 – Cryptologic Technician-Networks (CTN) rating converted to the Cyber Warfare Technician (CWT)

25 September 2023 – Maritime Cyber Warfare Officer (MCWO) 1880 established (Ref: 143/23).

29 November 2023 – NIOC Hawaii officially changed its name to NIOC Pacific

1 July 2022 – Last Limited Duty Officer (Cryptology) 6810 commissioned.


2022 – Fleet Information Warfare Command Pacific established as an Echelon III command

January 2022 – Maritime Space Officer designator (1870) established.

18 July 2021 – CTT1(IW) Robin Collins Killed while standing the watch in the C6F AOR.

16 January 2019 – CTICS(IW/EXW) Shannon M. Kent, USN, KIA in Manbij, Syria while supporting Combined Joint Task Force – Operation Inherent Resolved.

2018 – Cyber Mission Force (CMF) achieved full operation capability.

2017 – Naval Information Warfighting Development Center (NIWDC) established

13 March 2013 – CTTC(EXW/IDW/SW) Christian Pike, USN, died in Landstuhl, Germany due to head wound/injuries received while providing intelligence support in support of Naval Special Warfare and Afghan Commando operations.

17 January 2012 – LT Thomas C. Fouke, USN, died during physical training preparing to support Naval Special Warfare.

2012 – Cyber Mission Force (CMF) established.

1 October 2011 – Cryptologic Technician Maintenance (CTM) rating officially disestablished.

6 August 2011 – IT1 Jared W. Day, USN and CTR1 Michael J. Strange, USN, KIA in Afghanistan while supporting NAVAL Special Warfare.

5 February 2011 – SGT Lucas T. Pyeatt, USMC, KIA while serving in Afghanistan.

21 May 2010 – United States Cyber Command established.

21 September 2010 – CTRCS David “Blake” McLendon, USN, KIA in Afghanistan while supporting Naval Special Warfare.

29 January 2010 – U.S. Fleet Cyber Command/U.S. Tenth Fleet established.  U.S. Fleet Cyber Command is an echelon 2 command and U.S. Tenth Fleet is an echelon 3 command.  The mission is Electronic Warfare, Signal Intelligence and Cyber Operations.

22 June 2010: (ref NAVADMIN 206/10):

IDC designators are revised as the follows:

180X – Meteorology/Oceanography (remains the same)

181X – Information Warfare (disestablishes 161X and 164X designators)

182X – Information Professional (Disestablishes 160X Designator)

183X – Intelligence (Disestablishes 163X designator)

184X – Cyber Warfare Engineer (New)

185X – Any IDC Qualified officer billet (new)

2008 – CTM was disestablished and re-established in the same year

20 September 2008 – CTM3 Mathew J O’Bryant, USN, KIA while serving in Islamabad, Pakistan.

17 July 2008 – 1st Lt. Jason D. Mann, USMC, KIA in Garmsir, Afghanistan while serving as an Arab linguist, reconnaissance professional and ground intelligence officer.

6 July 2007 – CTT1(SW) Steven P. Daugherty, USN, KIA in Iraq while supporting Naval Special Warfare.

1 October 2007 – Cryptologic Technician Administrative (CTA) rating converted to the Yeoman (YN) rating.

2007 – U.S. Coast Guard Cryptologic Group (CGCG) established.

1 May 2005 – Cryptologic Officer Designators 1610, 1615, 164X AND 744X changed to Information Warfare Officer Designators.  1610 changed to 1810 (Information Warfare)

1 October 2005 – Cryptologic Technician Communications (CTO) rating merged into the Information Systems Technician (IT) rating.

30 September 2005 – Commander Naval Security Group (CNSG) disestablished.

2005 – Naval Security Group aligned under Naval Network Warfare Command (NETWARCOM).  Mission fundamentally changed as Navy’s lead for IO, Networks and Space.

6 Feb 2004 – CTN – Networks rating established.

1 October 2003 – Electronic Warfare (EW) rating merged with the Cryptologic Technician Technical (CTT).

11 July 2002 – Naval Network Warfare Command (NETWARCOM) established.

1 April 2001 – Hainan Island incident with an EP-3E.

November 1999 – Radioman (RM) rating converted to the Information Systems Technician (IT) rating in November 1999, after merging with the Data Processing Technician (DP) rating in 1998.

1995 – Relocation of Commander Naval Security Group (CNSG) HQ from Naval Security Station, Nebraska Ave in Washington D.C. to Fort Meade, MD.

1991 – CTR rating assumed Special Signals and Morse code

25 January 1987 – EA-3B went down in the Mediterranean killing CTI1 Patrick r. Price and CTI3 Craig H. Rudolf.  Five other were killed.

3 December 1979 – NSGA Sabana Seca Puerto Rico attacked.  CTO1 John Ball and RM3 Emil White were killed and 10 others were wounded.

26 March 1976 – Communication Technician rating changed to Cryptologic Technician.

12 December 1971 – RG -407 C-2A transport aircraft went down between the Philippians and Vietnam killing 10 Sailors, six were Cryptologist.

15 April 1969 – EC-121 Begger Shadow shot down over the Sea of Japan, off the coast of North Korea.  31 men were killed, many were Cryptologist:

June 1968 – Naval Security Group Command established under a flag officer.  Rear Admiral Ralph E. Cook, USN, become first Commander.

22 January 1968 – USS Pueblo (AGTR-2) captured by the North Koreans.

8 June 1967 – USS Liberty (AGTR-5) attacked, killing 34 men, many were Cryptologist

25 September 1965 – NSGA Kamiseya, Japan fire, that killed 12 Cryptologist.

July 1961 – The title “Head Naval Security Group” changed to “Director Naval Security Group.”

7 July 1961 – Naval Security Group Headquarters established.  Rear Admiral Leslie R. Schulz, USN first Commanding Officer.

May 1959 – Reorganization OP-30 becomes OP-94.  Rear Admiral Bernard F. Roeder, USN becomes OP-94-G (Head Naval Security Group).

June 1954 – Reorganization OP-20-2 becomes OP-30-2.  OP-30-G becomes Head Naval Security Group under Captain Morrison, USN.  Captain Morrison is the first “Head” of the Naval Security Group.

21 December 1953 – Registered Publications Issuing Office (s) returned to Naval Security Group.

24 October 1952 – The National Security Agency established.

July 1952 – Naval Communications Service changed to Naval Communications.

December 1950 – “Navy” in Navy Security Group changed to “Naval.” Navy Security Station 3801 Nebraska Avenue, NW, Washington, D.C. changed to Naval Security Station.  Naval Security Group under Chief of Naval Communications Service commanded by Captain John S. Holtwick, USN.

21 September 1950 – Naval Communications Annex Washington, 3801 Nebraska Avenue, NW, Washington, D.C. changed to Navy Security Station, 3801 Nebraska Avenue, Washington, D. C.

28 June 1950 – Naval Security Group under Head Security Branch (OP-202) established under Captain John S. Holtwick, USN.

1 September 1949 – Captain John S. Holtwick, USN becomes OP-20-2.

1 July 1949 – Captain E. S. L. Goodwin, USN becomes OP-20-2.

20 May 1949 – The Armed Forces Security Agency (AFSA) is established.

1948 – Communications Technician Rating (CT) established

6 November 1948 – Head Supplementary Activity Branch, Naval Communications Division (OP-20-2) established under Captain J.N. Wenger, USN.

29 August 1947 – All Communications Supplementary Activities (CSK’s) were disestablished and became components (departments) of the parent command under the commander officer.

10 July 1946 – All Navy Communications Intelligence Activities were officially named Communications Supplementary Activity (CSA).  CSA’s were Deputy Chief of Communications for Communications Supplementary Activity (OP-20-2).

April 1943 – $475,000 authorized or enlargement of intercept facilities at Wahiawa.

September 1942 – School facilities at Cheltenham enlarged to accommodate 75 men.

September 1942 – School facilities at Bainbridge enlarged to accommodate 100 men.

April 1942 – Corregidor evacuated to Melbourne.

January 1942 – Intercept Station “H” moved to Wahiawa.

July 1941 – CNO request further development of Medium Frequency fixed Adcock DF for strategic use.

July 1941 – 22 Navigational DF stations turned over to Coast Guard.

May 1941 – Request 30 additional RIP-5.

December 1940 – Strategic DF statin established at Toro Point.

November 1940 – 20-G requested immediate procurement of 20 RIP-5.

October 1940 –, Cavite (Philippians) moved to Corregidor (Philippians) and Shanghai decommissioned.

January 1940 – Department of Naval Communications (DNC) informed on status of plans for setting up strategic HFDF stations on Midway, Johnston and Palmyra in case of emergency

June 1938 – Congress authorized $85,000 for improvement Radio Facilities Corregidor.

11 March 1935 – Cryptologic activities named changed to the Communications Security Group.  Also, there is an association of the so called “OP-number”, which was OP-20-G from sometime before 3 April 1923 until 10 July 1946, when OP-20-G became OP-20-2.

August 1933 – CNO directs HFDF be installed in 1st and 12th Naval districts.

June 1933 – Experimental HFDF developed by Naval Research Laboratory and Bell Laboratories.

January 1931 – Experimental HFDF (Rotating Adcock) commissioned at Naval Research Laboratory.

1 October 1928 – First Kana operator course started at Main Navy Building in Washington D.C.  This was the first class of On-The-Roof-Gang.

1927 – Naval Research Laboratory requested to develop HFDF equipment.

1927 – Intercept station established at Peking to copy Japanese Diplomatic traffic.

1925 – Department of Naval Communications (DNC) requested DCO 14th N.D. assigns one operator to copy Japanese diplomatic traffic.

1924-1935- Naval cryptology service developed operational.

1924 – RIP-5 Kana typewriter designed and 4 ordered.  Note: The RIP-5 consisted of a typewriter modified to reproduce the kana for which Japanese Morse code letters stood.  It had been developed at the initiative of Captain, USN, Laurence Safford.

1923 – CNO Request Fleet Forces listen in on enciphered foreign traffic.

1922 – OP-20G established until after WWII.

1922 – Research Desk established in Security Office of Code and Signals section of Office Department of Naval Communications (DNC).

October 1917 – 11 March 1935 – Cryptologic activities in the Navy were under the auspices of an organizational Entity called the Code and Signal Section of the Office of Naval Communication (ONC).

28 July 1916 – US Navy Code and Signal Section established.  The Code and Signal Section was formally made a part of the Division of Naval Communications (DNC), as Op-20-G, on July 1, 1922.

1915 – Congress creates the Office of the Chief of Naval Operations (CNO).  Operation of the Naval Radio Service and many other means of communications are included among the responsibilities of the new office.  The Naval radio Service is reorganized and the Navy Department establishes the Office of Communications.  Outbreak of World War I results in formation of the Naval Communication Service.  Navy appoints the first Director of Naval Communication – Captain William H. G, Bullard, USN, directly responsible to the CNO.  Naval communications is put in a state of war readiness.