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The United States Naval Special Warfare Development Group (NSWDG), commonly known as DEVGRU or SEAL Team Six,[3][4] is the U.S. Navy component of the Joint Special Operations Command (JSOC). It is often referred to within JSOC as Task Force Blue.[4] DEVGRU is administratively supported by Naval Special Warfare Command and operationally commanded by the Joint Special Operations Command. Most information concerning DEVGRU is classified, and details of its activities are not usually commented on by either the Department of Defense or the White House.[5] Despite the official name changes, "SEAL Team Six" remains the unit's widely recognized moniker. It is sometimes referred to in the U.S. media as a Special Mission Unit.[6]

Naval Special Warfare Development Group
Naval Special Warfare Development Group.jpg
ActiveNovember 1980 – present
Country United States of America
Branch United States Navy
TypeSpecial operations force
Special Mission Unit
RoleCounter Terrorism
Hostage Rescue
Direct Action
Special Reconnaissance
Size1,787 personnel authorized:[1]
  • 1,342 military personnel
  • 445 civilian personnel
Part ofUnited States Special Operations Command Insignia.svg United States Special Operations Command
Seal of the Joint Special Operations Command.png Joint Special Operations Command
US NSWC insignia.jpg United States Naval Special Warfare Command
HeadquartersDam Neck Annex
NAS Oceana, Virginia Beach, Virginia, U.S.
Nickname(s)"SEAL Team Six", "DEVGRU", "Task Force Blue", "NSWDG"
EngagementsOperation Urgent Fury
TWA Flight 847 Hijacking
Achille Lauro hijacking
Operation Prime Chance
Operation Just Cause
Operation Desert Storm
Somali Civil War

Operation Uphold Democracy
Yugoslav Wars

Global War on Terrorism

Unit awardsPresidential Unit Citation[2]

DEVGRU and its Army counterpart Delta Force are the United States military's primary counter-terrorism units. Although DEVGRU was created as a maritime counter-terrorism unit targeting high-value targets, it has become a multi-functional special operations unit with several roles that include hostage rescue, special reconnaissance, direct action, personal security, and other specialized missions.



The origins of DEVGRU are in SEAL Team Six, a unit created in the aftermath of Operation Eagle Claw.[7][8][9] During the Iran hostage crisis in 1979, Richard Marcinko was one of two U.S. Navy representatives for a Joint Chiefs of Staff task force known as the TAT (Terrorist Action Team). The purpose of the TAT was to develop a plan to free the American hostages held in Iran. In the wake of the disaster at the Desert One base in Iran, the Navy saw the need for a full-time counter-terrorist unit, and tasked Marcinko with its design and development.

SEAL Team Six Patch

Marcinko was the first commanding officer of this new unit. At the time there were two SEAL Teams. Marcinko named the unit SEAL Team Six in order to confuse Soviet intelligence as to the number of actual SEAL teams in existence.[9][10][11] The unit's plankowners (founding members) were hand-picked by Marcinko from throughout the UDT/SEAL community. SEAL Team Six became the U.S. Navy's premier counter-terrorist unit. It has been compared to the U.S. Army's Delta Force.[5][8] Marcinko held the command of SEAL Team Six for three years, from 1980 to 1983, instead of the typical two-year command in the Navy at the time.[9] SEAL Team Six was formally created in October 1980, and an intense, progressive work-up training program made the unit mission-ready just six months later.[11] SEAL Team Six started with 75 shooters. According to Marcinko, the annual ammunition training allowance for the command was larger than that of the entire U.S. Marine Corps. The unit has virtually unlimited resources at its disposal.[12] In 1984, Marcinko and a dozen members of SEAL Team Six would go on to form "Red Cell", (also known as OP-06D), a special unit designed to test the security of American military installations.

In 1987, SEAL Team Six was dissolved. A new unit named the "Naval Special Warfare Development Group" was formed, essentially as SEAL Team Six's successor.[3][13][14] Reasons for the disbanding are varied,[9] but the name SEAL Team Six is often used in reference to DEVGRU.

Recruitment, selection and trainingEdit

NSWDG recruiting support personnel,[15] 2007

In the early stages of creating SEAL Team Six, Marcinko was given six months to get SEAL Team 6 up and running, or the whole project would come to an end. This meant that there was a timing issue and Marcinko had little time to create a proper selection course, similar to that of Delta Force, and as a result hand-picked the first plank owners of the unit after assessing their Navy records and interviewing each man. It has been said that Marcinko regretted not having enough time to set up a proper selection process and course. Originally applicants only came from the east and west coast SEAL teams and the UDTs. Although much of the ST6/DEVGRU training pipeline is classified there are some requirements and training exercises that are public knowledge. The requirements to apply for DEVGRU states that applicants must be male and come from the SDV teams, the Navy explosive ordnance disposal teams or EODs and East and West Coast SEAL teams, be 21 years old or older, and have at least served two combat tours on their previous assignments. Although, due to the combat experience requirement, it is not uncommon for a candidate to be in his early 30s. Marcinko's criteria for recruiting applicants was combat experience so he would know they could perform under fire; language skills were vital, as the unit would have a worldwide mandate to communicate with the local population if needed; union skills, to be able to blend in as civilians during an operation; and finally SEAL skills. Members of SEAL Team Six were selected in part because of the different specialist skills of each man.

Candidates must pass three days of physical and psychological testing that includes a Physical Screening Test (PST) where candidates must exceed the minimum requirements and perform at their highest level possible. Candidates are then interviewed by an oral review board to deem whether the candidate is suitable to undertake the selection phase.[16] Those who pass the stringent recruitment and selection process will be selected to attend a six- to eight-month Operators Training Course. Candidates will screen with the unit's training wing known as "Green Team". The training course attrition rate is high, usually around 50 percent; during one selection course, out of the original 20 candidates, 12 completed the course.[17] All candidates are watched closely by DEVGRU instructors and evaluated on whether they are suitable to join the individual squadrons. Howard E. Wasdin, a former member of SEAL Team Six said in a 2011 interview that 16 applied for SEAL Team Six selection course and two were accepted.[18] Those who do not pass the selection phase are returned to their previous assignments and are able to try again in the future.[19]

Like all special operations forces units that have an extremely intensive and high-risk training schedule, there can be serious injuries and deaths. SEAL Team Six/DEVGRU has lost several operators during training, including parachute accidents and close-quarters battle training accidents. It is presumed that the unit's assessment process for potential new recruits is different from what a SEAL operator experienced in his previous career, and much of the training tests the candidate's mental capacity rather than his physical condition, as he will have already completed Basic Underwater Demolitions/SEAL or the Navy EOD training pipeline.

Candidates are put through a variety of advanced training courses led by civilian or military instructors. These can include free-climbing, land warfare, advanced unarmed combat techniques, defensive and offensive advanced driving, advanced diving, communications and Survival, Evasion, Resistance and Escape (SERE) training. Candidates are also taught how to pick locks on cars, doors, and safes. All candidates must perform at the top level during selection, and the unit instructors evaluate the candidate during the training process. Selected candidates are assigned to one of the Tactical Development and Evaluation Squadrons; the others are returned to their previous units. Unlike the other regular SEAL Teams, SEAL Team Six operators are able to go on to attend almost any other military course to receive further training depending on the unit's requirements.

Like Delta Force, live fire marksmanship drills with live ammunition in both long range and close quarter battle drills are also done with hostage roles being played by other students to help build the candidates trust between each other.


DEVGRU is divided into color-coded line squadrons:[20]

  • Red Squadron (Assault)
  • Gold Squadron (Assault)
  • Blue Squadron (Assault)
  • Silver Squadron (Assault)
  • Black Squadron (Intelligence, Reconnaissance, & Surveillance)
  • Gray Squadron (Mobility Teams, Transportation/Divers)
  • Green Team (Selection/Training)[21]

Each assault squadron is divided into three troops of enlisted SEALs, often called assaulters, usually led by a Commander (O-5). Each of these troops is commanded by a senior commissioned officer, which is usually a Lieutenant Commander (O-4). A troop chief also serves as an adviser to the troop commander and is the highest enlisted SEAL in the troop, usually a Master Chief Petty Officer (E-9). A DEVGRU troop is further divided into smaller teams of SEALs.[22] These individual teams of assaulters are led by senior enlisted SEALs; usually a Senior Chief Petty Officer (E-8), sometimes a Chief Petty Officer (E-7). The rest of these teams are filled out with more Chief Petty Officers and Petty Officers First Class; each member with a respective role.

Each assault squadron also has a specific nickname. Examples include Gold Squadron's Knights, Red Squadron's Indians, Blue Squadron's Pirates, Gray Squadron's Vikings, etc.[20][23][24] The assault squadrons are supported by a variety of support personnel, including cryptologists, EOD technicians, dog handlers, and sometimes airmen from the United States Air Force 24th Special Tactics Squadron, the Air Force's JSOC element.

According to the GAO report on special operations forces, in the fiscal year of 2014, DEVGRU had a total of 1,787 authorized positions, of which 1,342 are military and 445 are civilian.[25]


The Department of Defense tightly controls information about DEVGRU, and refuses to comment publicly on the highly secretive unit and its activities. DEVGRU operators are granted an enormous amount of flexibility and autonomy. To conceal their identities, members only wear uniforms on combat deployments and extended training, preferring civilian clothing both on and off duty. When military uniforms are worn, they lack markings, surnames, or branch names. Civilian hair styles and facial hair are allowed to enable the members to blend in with different populations, and avoid recognition as military personnel.

Commanding officersEdit

Command of DEVGRU became a Captain's billet, following Marcinko's departure. Officers noted with a higher rank have since been promoted.

Roles and responsibilitiesEdit

Secretary of the Navy, Donald C. Winter is briefed on the Sentry HP UAV at Dam Neck, 2007

DEVGRU's full mission is classified but is thought to include preemptive, pro-active counter-terrorist operations, counter-proliferation (efforts to prevent the spread of both conventional weapons and weapons of mass destruction), as well as the elimination or recovery of high-value targets (HVTs) from unfriendly nations.[36][37] DEVGRU is one of a handful of U.S. Special Mission Units authorized the use of preemptive actions against terrorists and their facilities.[38]

When SEAL Team Six was first created in 1980 it was devoted exclusively to counter-terrorism with a worldwide maritime responsibility; its objectives typically included targets such as ships, oil rigs, naval bases, coastal embassies, and other civilian or military bases that were accessible from the sea or inland waterways. On certain operations small teams from SEAL Team Six were tasked with covertly infiltrating international high risk areas in order to carry out reconnaissance or security assessments of U.S. military facilities and embassies; and to give advice on improvements in order to prevent casualties in an event of a terrorist attack. SEAL Team Six was disbanded in 1987, and its role, minus non-CT ship-boarding which was given to the newly formed SEAL Team 8, given to the newly formed DEVGRU.[39]

Since the start of War on Terrorism, DEVGRU has evolved into a multi-functional special operations unit with a worldwide operational mandate. Such operations include the successful rescue of Jessica Buchanan and Poul Hagen Thisted, the attempted rescue of Linda Norgrove, the successful rescue of American doctor Dilip Joseph[40] and in 1991, the successful recovery of Haitian President Jean-Bertrand Aristide and his family during a coup that deposed him.

The official mission of the currently operating Naval Special Warfare Development Group mission is "to provide centralized management for the test, evaluation, and development of equipment technology and Techniques, Tactics and Procedures for Naval Special Warfare".[41]

DEVGRU and the Army's Delta Force train and deploy together on counter-terrorist missions usually as part of a joint special operations task force (JSOTF).[5][11][42][43]

The Central Intelligence Agency's highly secretive Special Activities Division (SAD) and more specifically its elite Special Operations Group (SOG) often works with, and recruits from, DEVGRU.[44] The combination of these units led ultimately to the killing of Al-Qaeda leader Osama bin Laden in Operation Neptune Spear.[45][46]


The Naval Criminal Investigative Service opened an investigation into the disappearance of $30,000 after the successful rescue operation of Captain Phillips of the Maersk Alabama by DEVGRU; the SEALs were polygraphed as part of the investigation and a Navy officer said that: "The case was ultimately closed without evidence of wrongdoing."[47]

A joint investigation by the British and American governments into the failed hostage rescue operation which was led by DEVGRU that resulted in the death of the British aid worker Linda Norgrove concluded that Norgrove was accidentally killed by a grenade thrown by a member of Seal Team Six.[48][49] Navy SEALs did not immediately notify senior officers about throwing the grenade; this breached military law,[49] and a number of sailors were disciplined.[49]

On June 4, 2017, US Green Beret Staff Sergeant Logan Melgar was found murdered by strangulation in Mali, in the US embassy's housing he shared with a few other Special Operations members on duty in Mali. While no one as of November 2017[needs update] is charged with the homicide, two unnamed members of DEVGRU who shortly after the murder were flown out of Mali back to the United States and placed on administrative leave are persons of interest to the Naval Criminal Investigative Service.[50][51] By February 2018, the strangulation had prompted a broad internal military audit and investigation of SEAL Team 6. This investigation has named the two DEVGRU members who are persons of interest in the homicide and has initially focused on analyzing their conflicting statements regarding Melgar's death. While they had stated that Melgar had been intoxicated on the evening of his death, he was determined to have no drugs or alcohol in his system when he died. Melgar was further determined to have had his throat and upper body mutilated in an apparent attempt at a tracheotomy. The two DEVGRU members have stated that they found Melgar unconscious and not breathing and that they tried to perform an emergency tracheotomy on him. One of the DEVGRU members has subsequently stated that he accidentally choked Melgar during a practice match. A continued focus of the investigation is allegations that Melgar had discovered that the two DEVGRU members had stolen cash earmarked for paying local informants and that he had told the two that he would report that. The two DEVGRU members deny this allegation.[52]

In November 2018, two Navy Seals, Petty Officer Anthony E. DeDolph and Chief Petty Officer Adam C. Matthews, along with two still unidentified Marine Raiders were charged with felony murder of Logan Melgar, and other crimes.[53][54]

See alsoEdit


  1. ^ "SEAL Team 6 by the Numbers - Foreign Policy". 28 July 2015. Archived from the original on 28 July 2015. Retrieved 10 June 2017.
  2. ^ Brook, Tom Vanden (16 May 2016). "Navy SEALs' secret medals reveal heroism over last 15 years". Navy Times. Retrieved 1 January 2017.
  3. ^ a b von Rosenbach, Alexander (May 4, 2011). "Devgru: Bin Laden's ultimate nemesis". IHS Jane's Defense & Security Intelligence & Analysis. Archived from the original on May 9, 2011. Retrieved June 18, 2013. Devgru was established in 1987 as the successor to SEAL Team 6 (although it is still colloquially known by this name). The unit serves as the US Navy's dedicated counter-terrorism unit and is believed to consist of about 200 personnel.
  4. ^ a b Naylor, Sean. Relentless Strike. Chapter 4.
  5. ^ a b c Emerson, Steven (13 November 1988). "Stymied Warriors". The New York Times Magazine. Retrieved 13 March 2008.
  6. ^ "In high demand, Air Force commandos must find new ways to cope with stress of duty". The Gaffney Ledger. Gaffney, South Carolina. Associated Press. Retrieved 2013-05-04.
  7. ^ Fallows, James (13 December 1981). "Iran from five American viewpoints". The New York Times.
  8. ^ a b Halloran, Richard (26 November 1986). "U.S. moving to expand unconventional forces". The New York Times. Retrieved 7 May 2011.
  9. ^ a b c d e Marcinko, Richard (1992). Rogue Warrior. New York: Pocket Books. ISBN 978-0-671-79593-1.
  10. ^ Pfarrer, Chuck (2011). SEAL Target Geronimo: The Inside Story of the Mission to Kill Osama Bin Laden. Macmillan. p. 178. ISBN 978-1-4299-6025-0.
  11. ^ a b c Gerth, Jeff; Philip Taubman (8 June 1984). "U.S. military creates secret units for use in sensitive tasks abroad". The New York Times.
  12. ^ Wasdin, Howard (9 May 2011). "'SEAL Team Six' And Other Elite Squads Expanding". NPR. Retrieved 19 May 2011.
  13. ^ "Naval Special Warfare Development Group (DEVGRU)". Global Security. Retrieved 18 June 2013.
  14. ^ Ambiner, Marc (10 October 2012). "Delta Force Gets a Name Change". The Atlantic. Retrieved 18 June 2013.
  15. ^ Abhan, Courtney Messman (30 July 2010). "Special Warfare Development Group seeks Sailors" (PDF). Naval Station Everett Public Affairs. Northwest Navigator. p. 3. Retrieved 14 September 2012. NSWDG is located in Virginia Beach, and is a type two sea duty cno priority one major command. The command is an elite counter terrorism unit that conducts research, and develops, tests, and evaluates current and emerging technology. This technology is related to special operations tactics and joint warfare to improve Special Forces war fighting capabilities. ... While at NSWDG, support personnel could have opportunities to earn many special qualifications, their expeditionary warfare specialist (EXW) pin, and Combat Service Support and Combat Support Naval Education Codes (NEC). Special qualifications include parachuting and fast roping, among many others. NSWDG support personnel receive special duty pay, and have some of the highest promotion rates in the Navy.
  16. ^ Anderson Cooper (3 May 2011). "'This is their type of op,' ex-SEAL says". CNN.
  17. ^ Pfarrer, Chuck (2004). Warrior Soul: The Memoir of a Navy Seal. New York: Random House. pp. 325–26. ISBN 978-0-89141-863-4. In one year, the operators of SEAL Six fire more bullets than entire USMC.
  18. ^ "The iron will of Seal Team 6". CBS News. 6 May 2011. Retrieved 19 May 2011.
  19. ^ "LCV Cities Tour: Interview with Howard Wasdin 'SEAL Team Six: Memoirs of an Elite Navy SEAL Sniper'". 22 June 2011. Retrieved 7 January 2012.
  20. ^ a b c Pfarrer, Chuck (2004). Warrior Soul: The Memoir of a Navy Seal. New York: Random House. pp. 325–26. ISBN 978-0-89141-863-4.
  21. ^ Owen, Mark (2012). No Easy Day. Dutton Adult. p. 11. ISBN 9780525953722.
  22. ^ Owen, Mark (2012). No Easy Day. Dutton Adult. p. 37. ISBN 9780525953722.
  23. ^ Combs, Cindy C; Slann, Martin W. (2007). Encyclopedia of Terrorism. Infobase Publishing. p. 289. ISBN 978-0-8160-6277-5.
  24. ^ Blehm, Eric (2013). Fearless: The Undaunted Courage and Ultimate Sacrifice of Navy SEAL Team SIX Operator Adam Brown. WaterBrook Press. ISBN 9780307730701.
  25. ^ "SEAL Team 6 by the Numbers". Foreign Policy. Retrieved 10 June 2017.
  26. ^ a b Mann, Don (2011). Inside SEAL Team Six: My Life and Missions with America's Elite Warriors. Little, Brown and Company. p. 142. ISBN 978-0-316-20431-6.
  27. ^ Arostegui, Martin C. (1997). "Get Noriega". Twilight Warriors: Inside the World's Special Forces. Macmillan. p. 290. ISBN 978-0-312-30471-3.
  28. ^ Marquis, Susan Lynn (1997). Unconventional warfare: rebuilding U.S. special operations forces. Brookings Institution Press. p. 34. ISBN 978-0-8157-5476-3.
  29. ^ Committee on Risk-Based Approaches for Securing the DOE Nuclear Weapons Complex, National Research Council (2011). Understanding and Managing Risk in Security Systems for the DOE Nuclear Weapons Complex. National Academies Press. p. 6. ISBN 978-0-309-20884-0.
  30. ^ Butler, Frank K.; John H. Hagmann; David T. Richards (2009). Tactical Management of Urban Warfare Casualties in Special Operations. Parabellum Concepts. p. 6.
  31. ^ a b Naylor, Sean (2006). Not a Good Day to Die: The Untold Story of Operation Anaconda. Penguin. p. 253. ISBN 978-0-425-20787-1.
  32. ^ "Rear Admiral Edward G. Winters, III". United States Navy. 30 June 2011. Retrieved 5 February 2012.
  33. ^ "Rear Admiral Brian L. Losey". United States Navy. 2014-11-18. Retrieved 2015-10-11.
  34. ^ "2 SEALs killed in Afghanistan fighting". Navy Times. Associated Press. 15 September 2008. Retrieved 2015-10-11. (Subscription required (help)). "The deaths of SOCS Marcum and SOC Freiwald are tremendous losses for Naval Special Warfare and the United States," Capt. DeAaron Vankeuren, commanding officer of Naval Special Warfare Development Group, said in a statement.
  35. ^ "Leader in Residence Program". Virginia Military Institute. Retrieved 2015-10-11.
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  37. ^ "Frequently Asked Questions". LT Michael P. Murphy USN. United States Navy. Archived from the original on 9 April 2008. Retrieved 20 May 2008.
  38. ^ U.S. Special Ops: America's Elite Forces in the 21st Century, Fred J. Pushies, MBI Publishing Company, 2003.
  39. ^ "DEVGRU". Retrieved 9 February 2018.
  40. ^ Qadir Sediqi,"U.S. Navy SEAL killed in operation to rescue American doctor in Afghanistan". CNN. 10 December 2012
  41. ^
  42. ^ Couch, Dick (2005). The Finishing School: Earning the Navy SEAL Trident. Three Rivers Press. ISBN 978-0-609-81046-0.
  43. ^ Bowden, Mark (2001). Black Hawk Down: A Story of Modern War. Signet. ISBN 978-0-451-20393-9.
  44. ^ Waller, Douglas (3 February 2003). "The CIA's Secret Army". Time.,9171,1004145-1,00.html
  45. ^ "Osama bin Laden killed in CIA operation". The Washington Post. 8 May 2011. Retrieved 19 May 2011.
  46. ^ Naylor, Mark Mazzetti, Nichols Kulish, Christopher Drew, Serge F. Kovaleski, Sean D.; Ismay, John (2015-06-06). "The Secret History of SEAL Team 6: Quiet Killings and Blurred Lines". The New York Times. ISSN 0362-4331. Retrieved 2015-06-06.
  47. ^ "$30G went missing in SEAL rescue of Capt. Phillips; SEALs given polygraph test". Fox News. Associated Press. October 11, 2013.
  48. ^ Harding, Thomas (15 Feb 2011). "Mistakes by US special forces led to death of aid worker Linda Norgrove, inquest finds". The Daily Telegraph.
  49. ^ a b c "Aid worker Linda Norgrove was killed by US grenade". BBC News. 2 December 2010.
  50. ^ Schmitt, Eric (2017-10-29). "2 Navy SEALs Under Suspicion in Strangling of Green Beret in Mali". The New York Times. Retrieved 2017-11-18.
  51. ^ Nichols, Hans; Gains, Mosheh (2017-11-13). "Witness: Navy SEAL Said He 'Choked' Green Beret Who Died". Retrieved 2017-11-24.
  52. ^ Cole, Matthew (2018-02-07). "U.S. Military Launches Broad Investigation of SEAL Team 6 After Green Beret Killing in Mali". The Intercept. Retrieved 2018-02-09.
  53. ^ "Navy SEALs, Marines Charged With Green Beret Logan Melgar's Murder".
  54. ^ "Navy SEALs and Marines charged with murdering Green Beret in horrific hazing incident: Prosecutors - ABC News".


External linksEdit