The Naval Special Warfare Development Group (NSWDG), commonly known as DEVGRU (DEVelopment GRoUp) or SEAL Team Six is the United States Navy component of the Joint Special Operations Command (JSOC). The unit is often referred to within JSOC as Task Force Blue. 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  Despite the official name changes, "SEAL Team Six" remains the unit's widely recognized moniker.

DEVGRU and its Army counterpart, 1st SFOD-D (Delta Force), are the U.S. military's primary Tier 1 Special Mission Units tasked with performing the most complex, classified, and dangerous missions directed by the National Command Authority. Although DEVGRU was created as a counter-terrorism unit targeting high-value targets, it has become multi-functional 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.[8][9][10] 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.

Navy Unit Commendation awarded to SEAL TEAM SIX for exceptional meritorious service from November 1980 to October 1982.

SEAL Team Six Patch

Marcinko was the first commanding officer of this new unit. At the time there were only two SEAL Teams, SEAL Team ONE and SEAL Team TWO. Marcinko named the unit SEAL Team Six in order to confuse Soviet intelligence as to the number of actual SEAL teams in existence. The unit's plankowners (founding members) were interviewed and hand-picked by Marcinko from throughout the UDT/SEAL community. SEAL Team Six was formally commissioned in November 1980, and an intense, progressive work-up training program made the unit mission-ready just six months later. SEAL Team Six became the U.S. Navy's premier hostage rescue and counter-terrorist unit. It has been compared to the U.S. Army's elite Delta Force.[5][9] Marcinko held the command of SEAL Team Six for three years, from 1980 to July 1983, instead of the typical two-year command in the Navy at the time.[10] 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.[citation needed][original research?] The unit has virtually unlimited resources at its disposal.[13] 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][14][15] Reasons for the disbanding are varied,[10] but the name SEAL Team Six is often used in reference to DEVGRU.

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