of a shooting club formed specifically for the use of firearms comes from Lucerne, Switzerland, where one club has a charter dating from 1466. During the American Civil War, Confederate marksmen equipped with the imported Whitworth rifles were known as the Whitworth Sharpshooters. Snipers are also called "hunters" in many languages, due to the nature of the craft (with the hunting horn also being a symbol of marksmanship), being called Caçadores, Chasseurs and Jägers. Other words for sniper include franc-tiréur, tiréur d'élite and atirador de escol. Modern warfare Military doctrine Different countries use different military doctrines regarding snipers in military units, settings, and tactics. Generally, a sniper's primary function in modern warfare is to provide detailed surveillance from a concealed position and, if necessary, to reduce the enemy's combat ability by neutralizing high-value targets (especially officers and other key personnel) and in the process pinning down and demoralizing the enemy. Typical sniper missions include managing intelligence information they gather during reconnaissance, target acquisition and impact feedback for air strikes and artillery, assisting employed combat force with accurate fire support and counter-sniper tactics, killing enemy commanders, selecting targets of opportunity, and even destruction of military equipment, which tend to require use of anti-materiel rifles in the larger calibers such as the .50 BMG, like the Barrett M82, McMillan Tac-50, and Denel NTW-20. Soviet- and Russian-derived military doctrines include squad-level snipers. Snipers have increasingly been demonstrated as useful by US and UK forces in the recent Iraq campaign in a fire support role to cover the movement of infantry, especially in urban areas. Military snipers from the US, UK and other countries that adopt their military doctrine are typically deployed in two-man sniper teams consisting of a shooter and a spotter. A common practice is for a shooter and a spotter to take turns to avoid eye fatigue. In most recent combat operations occurring in large densely populated towns, such as Fallujah, Iraq, two teams would be deployed together to increase their security and effectiveness in an urban environment. A sniper team would be armed with a long-range weapon and a rapid-firing shorter-ranged weapon in case of close quarter combat. The German doctrine of largely independent snipers and emphasis on concealment, developed during the Second World War, has been most influential on modern sniper tactics, and is currently used throughout Western militaries (examples are specialized camouflage clothing, concealment in terrain and emphasis