Had he failed to do so, the project would have been canceled. In the early stages of creating SEAL Team Six, Marcinko was given a six-month window to produce the team. Reasons for the disbanding are varied, but the name SEAL Team Six is often used in reference to DEVGRU.

A new unit named the 'Naval Special Warfare Development Group' was formed, essentially as SEAL Team Six's successor. 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. The unit has virtually unlimited resources at its disposal. 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. Navy's premier hostage rescue and counter-terrorism unit. SEAL Team Six was formally commissioned in November 1980, and an intense, progressive work-up training program made the unit mission-ready six months later. The unit's plankowners (founding members) were interviewed and hand-picked by Marcinko from throughout the UDT/SEAL community. Marcinko named the unit SEAL Team Six in order to confuse Soviet intelligence as to the number of actual SEAL teams in existence. At the time, there were two SEAL Teams, SEAL Team ONE and SEAL Team TWO. Marcinko was the first commanding officer of this new unit. DEVGRU conducts various specialized missions such as counterterrorism, hostage rescue, special reconnaissance, and direct action (short-duration strikes or small-scale offensive actions), often against high-value targets. military's primary Tier 1 special mission units tasked with performing the most complex, classified, and dangerous missions directed by, until 2002, the National Command Authority, and since then, directly from the President or the Secretary of Defense. Despite the official name changes, ' SEAL Team Six' remains the unit's widely recognized moniker.ДEVGRU and its Army and Air Force counterparts ( Delta Force and 24th Special Tactics Squadron) are the U.S. Most information concerning DEVGRU is designated as classified information, and details of its activities are not usually commented on by either the United States Department of Defense or the White House. DEVGRU is administratively supported by Naval Special Warfare Command and operationally commanded by JSOC. The unit is often referred to within JSOC as Task Force Blue. The Naval Special Warfare Development Group ( NSWDG), abbreviated as DEVGRU (DEVelopment GRoUp) and commonly known as SEAL Team Six, is the United States Navy component of the Joint Special Operations Command (JSOC). Stabilisation Force in Bosnia and Herzegovina.'SEAL Team Six', 'DEVGRU', 'Task Force Blue', 'NSWDG' NAS Oceana, Virginia Beach, Virginia, U.S. United States Naval Special Warfare Command

For the television series, see SEAL Team (TV series) and Six (TV series). For the multinational police force, see Special Team Six.

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