HMAS Murchison (K442)

Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. With an area of 7,617,930 square kilometres (2,941,300 sq mi), Australia is the largest country by area in Oceania and the world's sixth-largest country. Australia is the oldest, flattest, and driest inhabited continent, with the least fertile soils. It is a megadiverse country, and its size gives it a wide variety of landscapes and climates, with deserts in the centre, tropical rainforests in the north-east, and mountain ranges in the south-east.

Brisbane is the capital and most populous city of Queensland, and the third-most populous city in Australia and Oceania with a population of approximately 2.6 million. Brisbane lies at the centre of South East Queensland, which includes several other regional centres and cities. The central business district is situated within a peninsula of the Brisbane River about 15 km (9 mi) from its mouth at Moreton Bay. Brisbane is located in the hilly floodplain of the Brisbane River Valley between Moreton Bay and the Taylor and D'Aguilar mountain ranges. It sprawls across several local government areas, most centrally the City of Brisbane. The demonym of Brisbane is Brisbanite.

The Murchison River is the second longest river in Western Australia. It flows for about 820 km (510 mi) from the southern edge of the Robinson Ranges to the Indian Ocean at Kalbarri. The Murchison-Yalgar-Hope river system is the longest river system in Western Australia. It has a mean annual flow of 208 gigalitres, although in 2006, the peak year on record since 1967, flow was 1,806 gigalitres.

Western Australia is a state of Australia occupying the western 33 percent of the land area of Australia, excluding external territories. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to the south, the Northern Territory to the north-east, and South Australia to the south-east. Western Australia is Australia's largest state, with a total land area of 2,527,013 square kilometres (975,685 sq mi). It is the second-largest country subdivision in the world, surpassed only by Russia's Sakha Republic. As of 2021, the state has 2.76 million inhabitants—11 percent of the national total. The vast majority live in the south-west corner; 79 percent of the population lives in the Perth area, leaving the remainder of the state sparsely populated.

Morotai Island is an island in the Halmahera group of eastern Indonesia's Maluku Islands (Moluccas). It is one of Indonesia's northernmost islands.

Ternate, also known as the City of Ternate, is a city in the Indonesian province of North Maluku and an island in the Maluku Islands. It was the de facto provincial capital of North Maluku before Sofifi on the nearby coast of Halmahera became the capital in 2010. It is off the west coast of Halmahera, and is composed of eight islands: Ternate, the biggest and main island of the city, and Moti, Hiri, Tifure, Mayau, Makka, Mano, and Gurida. In total, the city has a land area of 162.17 square kilometres and had a total population of 185,705 according to the 2010 census, and 205,001 according to the 2020 census, with a density of 1,264 people per square kilometre. It is the biggest and most densely populated city in the province, is the economic, cultural, and education center of North Maluku, and acts as a hub to neighbouring regions. It was the capital of the Sultanate of Ternate in the 15th and 16th centuries, and fought against the Sultanate of Tidore over control of the spice trade in the Moluccas before becoming a main interest to competing European powers.

Sulawesi, also known as Celebes, is an island in Indonesia. One of the four Greater Sunda Islands, and the world's eleventh-largest island, it is situated east of Borneo, west of the Maluku Islands, and south of Mindanao and the Sulu Archipelago. Within Indonesia, only Sumatra, Borneo, and Papua are larger in territory, and only Java and Sumatra have larger populations.

The British Commonwealth Occupation Force (BCOF) was the British Commonwealth taskforce consisting of Australian, British, Indian and New Zealand military forces in occupied Japan, from 1946 until the end of occupation in 1952.

The Korean War was fought between North Korea and South Korea from 1950 to 1953. The war began on 25 June 1950 when North Korea invaded South Korea following clashes along the border and rebellions in South Korea. North Korea was supported by China and the Soviet Union while South Korea was supported by the United States and allied countries. The fighting ended with an armistice on 27 July 1953.

A battle honour is an award of a right by a government or sovereign to a military unit to emblazon the name of a battle or operation on its flags ("colours"), uniforms or other accessories where ornamentation is possible.

The Montebello Islands, also rendered as the Monte Bello Islands, are an archipelago of around 174 small islands lying 20 km (12 mi) north of Barrow Island and 130 km (81 mi) off the Pilbara coast of north-western Australia. The islands form a marine conservation reserve of 58,331 ha administered by the Western Australian Department of Environment and Conservation. The islands were the site of three British atmospheric nuclear weapons tests in 1952 and 1956.

Operation Hurricane was the first test of a British atomic device. A plutonium implosion device was detonated on 3 October 1952 in Main Bay, Trimouille Island, in the Montebello Islands in Western Australia. With the success of Operation Hurricane, Britain became the third nuclear power, after the United States and the Soviet Union.