Why is "Royal Australian Artillery" trending?

Wikipedia Overview

The Royal Regiment of Australian Artillery, normally referred to as the Royal Australian Artillery (RAA), is a Regiment of the Australian Army descended from the original colonial artillery units prior to Australia's federation. Australia's first guns were landed from HMS Sirius and a small earthen redoubt built, near the present-day Macquarie Place, to command the approaches to Sydney Cove. The deployment of these guns represents the origins of artillery in Australia. These and subsequent defences, as well as field guns, were operated by marines and the soldiers of infantry regiments stationed in Australia. Unlike their British and Canadian equivalents, there are no regiments of horse artillery in the order of battle of the Royal Australian Artillery. The First World War saw the raising of 60 field, 20 howitzer, and two siege batteries along with the heavy and medium trench mortar batteries. Until 19 September 1962 the Australian Artillery was referred to as the 'Royal Australian Artillery', however, on this date Queen Elizabeth II granted the RAA the title of 'The Royal Regiment of Australian Artillery'. The Regiment today consists of Regular and Reserve units.