on coup d'œil). Sniper teams Sniper rifles are classified as crew-served in the United States military. A sniper team (or sniper cell) consists of a combination of at least one primary weapon operator, (ie: the shooter), with other support personnel and force protection elements, such as a spotter or a flanker. Within the Table of Organization and Equipment for both the United States Army and Marine Corps, the shooter does not operate alone, but has a backup shooter trained to fulfill multiple roles in addition to being sniper-qualified in the operation of the main weapon. The shooter focuses mainly on firing the shot, while the spotter assists in observation of targets, accounts for atmospheric conditions and handles ancillary tasks as immediate security of their location, communication with other parties (e.g. directing artillery fire and close air support). A flanker is an extra teammate who is tasked to act as a sentry observing areas not immediately visible to the sniper and spotter, assisting with the team's rear security and perimeter defense, and therefore are usually armed with a faster-firing weapon such as an assault rifle, battle rifle or designated marksman rifle. Both the spotter and flanker carry additional ammunition and associated equipment. The spotter is responsible for detecting, identifying and assigning priority of targets for the shooter, as well as assessing the outcome of the shot. Using a spotting scope and/or a rangefinder, the spotter will predict the external ballistics and read the wind speed using an anemometer or physical indicators like the mirage caused by ground heat. Also, in conjunction with the shooter, the spotter will calculate the distance, shooting angle (slant range), mil-related correction, interference by atmospheric factors and the required leads for moving targets. It is not unusual for the spotter to be equipped with a ballistic table, a notebook or a tablet computer specifically for performing these calculations. Law enforcement applications Law enforcement snipers, commonly called police snipers, and military snipers differ in many ways, including their areas of operation and tactics. A police sharpshooter is part of a police operation and usually takes part in relatively short missions. Police forces typically deploy such sharpshooters in hostage scenarios. This differs from a military sniper, who operates as part of a larger army, engaged in warfare. Sometimes as part of a SWAT team, police snipers are deployed alongside negotiators and an assault team trained for close quarters combat.