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Chalker initially served with SEAL Team One but was hand-selected by Commander Richard Marcinko to become a plankowner of the Navy's first dedicated counter-terrorist unit, SEAL Team Six.
SEAL Team Six was released May 10, 2011, only a week after DEVGRU took part in the operation that killed Osama Bin Laden.
The United States Naval Special Warfare Development Group (SEAL Team Six or ST6), the United States Navy's secretive tier-one Counter-Terrorism and Special Mission Unit