Who are the special soldiers who guard the Vatican?

Swiss Guards

The Swiss Guard consists of 6 officers and 110 men. All members of the guard must be Swiss.

Clarification:

The Swiss Guards are the body guards of the Pope and the only remaining military unit in the Vatican. They do not guard the Vatican, however. The Vatican Police are charged with guarding the Vatican and maintaining Law and Order. They are not considered members of the military, however.