The Royal Australian Navy Ships HMAS Sydney, Warramunga, and Sirius, which are based on both the east and west coast of Australia, have concluded their participation in Exercise Blue Raptor in the Northwest Shelf area. Exercise Blue Raptor was a maritime security exercise which tested communications, procedures and protocols between the Navy ships and other units of the Australian Defense Force with the oil and gas installations in the area. The exercise is part of a number of routine patrols conducted by the Navy in the region and was supported by a Royal Australian Air Force AP-3C Orion.