Holy See
Although the Holy See is sometimes metonymically referred to as the "Vatican", the Vatican City State was distinctively established with the Lateran Treaty (1929) between the Holy See and Italy to ensure the temporal, diplomatic, and spiritual independence of the Papacy. As such, ambassadors are officially accredited to the Holy See and not the Vatican City State. Conversely, Papal nuncios to states and international organisations are recognised as representing the Holy See and the integrity of the Catholic Church along with its 1.3 billion members, not the Vatican City State, as prescribed also in the Canon law of the Catholic Church (1983). The "Holy See" thus refers to the See of Rome viewed as the central government of the Catholic Church. The Catholic Church, in turn, is the largest non-government provider of education and health care in the world, while the diplomatic status of the Holy See facilitates the access of its vast international network of charities.
Military in Vatican City
The Papal Gendarmerie Corps () was formed in 1816 by Pope Pius VII, originally under the name of Papal Carabinieri Corps. The unit was formed as a military police unit. In 1849 Pope Pius IX renamed it as the Papal Velites Regiment, and subsequently as the Papal Gendarmerie Corps. It saw active military engagements in the battles which culminated in the abolition of the Papal States. It survived (greatly reduced in size) into the period of the Vatican City State, as a "de facto" Vatican military unit from 1929 to 1970, providing internal security.