Island Command Greenland, or simply "GLK", was a Level II authority responsible directly to the Defence Command. It was, among other things, responsible for the military defense of Greenland, maritime and sovereignty maintenance and enforcement, as well as search and rescue. Personnel assigned to the Danish liaison office at Thule Air Base (FOTAB) as well as the Sirius Patrol were also a part of the Greenland Command. Island Command Greenland was amalgamated with Island Command Faroes to a Joint Arctic Command on 31 October 2012.