There are different military doctrines regarding the use of snipers in military units, tactics, and settings throughout the world. A sniper's main objective is generally to strike at commanding officers or opposing force's equipment, to weaken the enemy's fighting ability. Military snipers from a lot of countries are typically deployed in two-man sniper teams consisting of a shooter and spotter. The two have different functions, but it is common for the shooter and spotter to take turns in order to avoid eye fatigue. Besides striking officers and equipment, another large role the sniper plays is reconnaissance. Snipers also have to be able to give detailed information about the enemies position, and provide detailed drawings of the enemies position.