"Swiss Guards, who are all Swiss citizens, live in their own barracks inside the Vatican, where they also train and take their meals, served by Swiss nuns. Theirs is an insular community even within the close-knit world of the Vatican. Young guards and even officers sometimes chafe at the rigid discipline and restrictions of both army and church. In uniform they carry seven-foot pikes and tear gas. They do not carry guns but are trained in shooting. On papal trips some guards sometimes carry sidearms, and there is a gun room in the barracks, which is at St. Anne's Gate, a prominent Vatican entryway."
http://query.nytimes.com/gst/fullpage.html?res=9C07EFDC1631F936A35756C0A96E958260&sec=health&pagewanted=printThe aove quotation is from an article about the shooting deaths of several members of the Swiss Guard inside the Vatican. THough they carrry ancient halberds for ceremonial duties, they do have arms inside the Vatican. Anyway, all the Swiss Guards are volunteers whom have already served in the Swiss army,