Can you shed some light on the history of 21 gun salute?
http://www.history.army.mil/faq/salute.htm What is the origin of the 21-gun salute? The use of gun salutes for military occasions is traced to early warriors who demonstrated their peaceful intentions by placing their weapons in a position that rendered them ineffective. Apparently this custom was universal, with the specific act varying with time and place, depending on the weapons being used. A North African tribe, for example, trailed the points of their spears on the ground to indicate that they did not mean to be hostile. The tradition of rendering a salute by cannon originated in the 14th century as firearms and cannons came into use. Since these early devices contained only one projectile, discharging them once rendered them ineffective. Originally warships fired seven-gun salutes–the number seven probably selected because of its astrological and Biblical significance. Seven planets had been identified and
