But that is a special force - not part of the regular military. They originally began as Swiss mercenaries. http://www.vatican.va/roman_curia/swiss_guard/swissguard/storia_en.htm
To know more we must go back to the period of the Renaissance and discover the motives that in 1506 caused Pope Julius II to invite to Rome the Helvetian soldiers, renowned for their courage, noble sentiments and loyalty. Many centuries earlier the great Latin historian, Tacitus, had said: "The Helvetians are a people of warriors, famous for the valour of their soldiers." This is why the Swiss Cantons, as allies first with one side and then with another, played such an important role in the history of European politics. In fact as allies of Pope Julius II in 1512 they helped to shape Italy's destiny and were granted by the Pope the title of "Defenders of the Church's freedom". In those times, when to be a mercenary soldier was a commonplace occupation, there lived a people of warriors in the very heart of the Alps. The first Swiss Cantons had about 500,000 inhabitants and formed an overpopulated country, where, because of the precarious economic conditions of the times, there was much poverty. There was no choice but to emigrate and one of the most profitable jobs was that of a mercenary soldier abroad.
There were some 15,000 men available for this type of work which was "organized" and controlled by the small Confederation of Cantons. The Confederation authorized the enlistment of the men and in return received corn, salt, or other commercial goods. The men themselves regarded this warring as a temporary period of summer emigration. They took part in brief but glorious wars and then returned home with the "pay" and the booty, to spend the winter. They were the best troops of those times. Without cavalry and with little artillery, they had invented a tactic of movement that was superior to all others. Therefore they were in great demand both by France and by Spain. They were similar to a semimobile rampart, standing tall and impenetrable, and it is impossible to understand the Italian Wars without taking these mercenaries into account. Already in the 13th and 14th centuries, after the Swiss Cantons had become independent, many of their men were fighting in Germany and Italy and as the Cantons were unable to prevent this type of emigration, they sought at least to organize it.
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