Slædepatruljen Sirius (Sirius Sled Patrol) or informally Siriuspatruljen (Sirius Patrol) is a unique elite Danish navy unit that conducts long-range reconnaissance patrolling, and enforces Danish sovereignty in the Arctic wilderness of Northern and Eastern Greenland, an area that includes the largest national park in the world. Patrolling is usually done in pairs, sometimes for four months and often without additional human contact.
The Sirius Patrol has the ability to engage militarily, and has done so historically. Unlike other military units, however, the Sirius Patrol is not expected to engage in combat operations. Its purpose is solely to maintain Danish sovereignty and police the area of responsibility. The physical and psychological demands for acceptance into the unit are exceptional.