Admiralty
It evolved from *Admiralty Navy War Council, (1909–1912) which in turn became the Admiralty War Staff, (1912–1917) before finally becoming the Admiralty Naval Staff in 1917. It was the former senior command, operational planning, policy and strategy department within the British Admiralty. It was established in 1917 and existed until 1964 when the department of the Admiralty was abolished, and the staff departments function continued within the Navy Department of the Ministry of Defence until 1971 when its functions became part of the new Naval Staff, Navy Department of the Ministry of Defence.
British Army
The British Army historically included many units from what are now separate Commonwealth "realms". When the English Empire was established in North America, Bermuda, and the West Indies in the early Seventeenth Century there was no standing English Army, only the Militia, and this was extended to the colonies. Colonial Militias defended colonies single-handedly at first against Indigenous peoples and European competitors. Once the standing English Army, later the British Army, came into existence, the colonial Militias fought side-by-side with it in a number of wars, including the Seven Years' War. Some of the colonial Militias rebelled during the American War of Independence. Militia fought alongside the regular British Army (and Native allies) in defending British North America from their former countrymen during the American War of 1812. With the growth of the Empire around the world, "Non-European" (i.e., non-white, except for officers) units were recruited in many colonies and protectorates, but most were deemed auxiliaries and not part of the British Army. The West India Regiments were an exception, as they were fully incorporated into the British Army, but were kept outside of Europe and non-whites were denied commissions. Locally raised units in strategically-located colonies (including Bermuda, Gibraltar, Malta) and the Channel Islands were generally more fully integrated into the British Army as evident from their appearances in British Army Lists, unlike units such as King's African Rifles. The larger colonies (Australia, New Zealand, Canada, South Africa, et cet.) mostly achieved Commonwealth Dominion status before or after the First World War and were granted granted full legislative independence in 1931. While remaining within the British Empire, this placed their governments on a par with the British Government, and hence their military units comprised separate armies (e.g. the Australian Army), although Canada retained the term Militia for its military forces until the Second World War. From the 1940s, these Dominions and many colonies chose full independence, usually becoming Commonwealth realms (as member states of the Commonwealth are known today).