More than 2000 military personnel are participating in a Royal Australian Navy training exercise in Bass Strait.
Fleet Certification Period 2020 is the Navy's first major exercise of the year, and will also include military aircraft from Australia, the United States, and New Zealand.
Four warships - HMA Ship Hobart, Stuart, Arunta, and Sirius - will war game alongside five other Australian ships and submarines.
Also taking part is aircraft such as a Royal Australian Air Force P-8A, a United States Navy P-8, and Royal New Zealand Air Force P-3k, and three RAN MH-60R helicopters.
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The aim is to further develop the Navy's ability to engage in complex warfighting activities, based around sea and air control capabilities.
Commodore Flotillas Commodore Michael Harris OAM, RAN said the exercise would focus on high-end warfighting to certify participating units to deploy on behalf on the Australian Government.
"FCP20 will test competencies in a range of scenarios, including high-end warfighting in the blue water ocean environment, amphibious operations, and humanitarian assistance and disaster relief, similar to our recent bushfire support activities," Commodore Harris said.
It is the first time a Hobart-Class Destroyer, HMAS Hobart, has participated in a fleet certification period.
FCP20 will include port visits to Launceston, Burnie, and Devonport, and Melbourne and Portland.