It is known as one of the most experienced and specialized units of its kind in the world. The unit has taken part in hundreds of operations in and outside the borders of Israel. The Yasam is a riot police and crowd control unit, and also participates in counter-terror operations. The unit, originally started as Riot Police, was called upon to assist with counter-terror operations, as well as dismantling settlements in accordance with the Israeli court decisions. The Yasam has sub-units of Rapid Response Motorcycle Units. The Yamas is a counter-terrorist commando unit. It's operators are trained in conducting operations undercover, disguised as civilians. Although officially part of the Border Police, it is directly subordinate to Shin Bet, the Israeli internal security service. The National Traffic Police is the police's traffic enforcement arm. It is divided into five regional districts and a national patrol unit. The Civil Guard is the police's force of part-time volunteer officers, who comprise the majority of Israeli police officers. It is officially a division of the Security and Community Policing Branch. Civil Guard volunteers have limited police powers. They carry out patrols in public, are trained to provide the initial response to any security situation they encounter until regular police forces arrive, and partake in traffic control. The Civil Guard also has search and rescue teams. Lahav 433 is the police's unit for investigations of serious crimes and corruption. The Police SIGINT Unit is responsible for signals intelligence (SIGINT) activities. The Dog Handling Unit is responsible for operating police dogs. The Police Aerial Unit operates police helicopters. The Police Marine Unit is responsible for operating boats and has police divers. The Israel Police Bomb Disposal Unit is the bomb squad of the police. It deals with operations and investigations which involve suspicious objects, explosive devices or military ordnance. The Seif Unit is responsible for tackling crime in the Israeli-Arab population. The Division of Identification and Forensic Science is responsible for forensic science in investigations. It has laboratories dealing with latent fingerprint analysis, arson investigation, mass spectrometry and explosive analysis, digital evidence, DNA and other areas of biology, firearms, and questioned document examination. The Internal Investigations Department is responsible for investigating wrongdoing by police personnel. It is officially independent from the police and under the jurisdiction of the Justice Ministry. Weapons and equipment Each patrol officer is armed with a pistol (handgun) which he or she