Island Command Greenland (Danish: Grønlands Kommando), 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 (Danish: Slædepatruljen SIRIUS) 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.
It also functioned as NATO's Island Commander Greenland, formerly part of Allied Command Atlantic. ACLANT became Allied Command Transformation in 2003, and since then it was not clear exactly how the command now fits into the NATO Military Command Structure.
The Danish military can trace its activities in Greenland back to the time of Hans Egede. From the late 18th century up to World War II, personnel from the Danish military contributed very actively to the exploration of Greenland, by land, sea and air.
After the Second World War fishing inspections and sea measuring began again and the first dedicated Greenland command was established, called the "Greenland Maritime Command", located at Nuuk (Danish: Godthåb). On August 1, 1951 it changed name to the "Island Command Greenland", while simultaneously moving from Nuuk to the Naval base at Kangilinnguit (Danish: Grønnedal, at that time it was only a Marine station), where it has been ever since.