Guard mounting

Guard mounting, changing the guard, or the changing of the guard, is a formal ceremony in which sentries performing ceremonial guard duties at important institutions are relieved by a new batch of sentries. The ceremonies are often elaborate and precisely choreographed. They originated with peacetime and battlefield military drills introduced to enhance unit cohesion and effectiveness in the late 17th and early 18th centuries.

Soldiers from the National Guards Unit of Bulgaria being relieved by their replacements during a guard mounting ceremony