DEVGRU / SEAL Team Six
Naval Special Warfare Development Group, otherwise known as 'DEVGRU' or 'SEAL Team 6', is a Counter Terrorism unit administered by US Naval Special Warfare Command. An elite within an elite, the unit is made up of SEALs selected from existing SEAL Teams. DEVGRU is considered a 'Tier One' special mission unit on a par with the Army's Delta Force. SEAL Team Six is under operational command of JSOC.
SEAL Team Six - Organization
DEVGRU / ST6 is organized into 4 line squadrons codenamed Red Squadron, Blue Squadron, Gold Squadron and Silver Squadron.
Each line squadron contains around 50 operators and each squadron is divided into 3 troops. Troops will typically be divided into teams of assaulters and snipers.
Some sources indicate that DEVGRU includes a Gray Squadron, which is a specialist boat squadron dedicated to maritime operations.
There is also a Black Squadron (Reconnaissance and Surveillance squadron) which appears to have a role similar to the army's Intelligence Support Activity.
http://www.americanspecialops.com/devgru/
