Captain (Capt) is a junior officer rank of the British Army and Royal Marines and in both services it ranks above lieutenant and below major with a NATO ranking code of OF-2. The rank is equivalent to a lieutenant in the Royal Navy and to a flight lieutenant in the Royal Air Force .
Lieutenant (UK: / l ɛ f ˈ t ɛ n ə n t /; Lt) is a junior officer rank in the British Army and Royal Marines. It ranks above second lieutenant and below captain and has a NATO ranking code of OF-1 and it is the senior subaltern rank. Unlike some armed forces which use first lieutenant, the British rank is simply lieutenant, with no ordinal
As Captain General Royal Marines, Prince Harry was entitled to wear the rank insignia of a Field Marshal or Major General. Despite this, Prince Harry, at least on some occasions, wore the rank insignia of a Colonel ,   which is traditionally worn by some Colonels-in-chief in the British Army .
The British Army, composed primarily of cavalry and infantry, was originally one of two Regular Forces within the British military (those parts of the British Armed Forces tasked with land warfare, as opposed to the naval forces), with the other having been the Ordnance Military Corps (made up of the Royal Artillery, Royal Engineers, and the Royal Sappers and Miners) of the Board of Ordnance ...
The evolution of the title in the Spanish Navy is parallel to that of the army. During the 16th and 17th century the two main naval captain general posts were Capitán-General de la Armada del Mar Océano and Capitán-General de Galeras, roughly CIC for the Atlantic and the Mediterranean respectively.
In 1886, he transferred from the Royal Marines to the British Army, largely because he felt it offered better prospects of promotion. The American historian John Semple Galbraith wrote that "Townshend was an inveterate self-advertiser, constantly and actively promoting his own brilliance in the hope of recognition by a grateful country, preferably in the form of a KCB ."
After the Crimean War (30 January 1855), the War Office ordered different rank badges for British general, staff officers and regimental officers. It was the first complete set of rank badges to be used by the British Army. Field Marshal: Two rows of one inch wide oak-leaf designed lace on the collar with crossed baton above the wreath in silver.