A police tactical unit (PTU) is a specialized police unit trained and equipped to handle situations that are beyond the capabilities of ordinary law enforcement units because of the level of violence (or risk of violence) involved. A police tactical unit's tasks may include: executing dangerous search warrants and arrest warrants for dangerous persons; arresting or neutralizing dangerous or mentally ill armed persons; and intervening in high risk situations such as shootouts and standoffs, or hostage and terrorist incidents. Police tactical units are dedicated units composed of personnel selected and trained in tactical skillsets to carry out the responsibilities of the unit, and in use of force policies, including lethal force for counter-terrorism. A PTU is equipped with specialized police and military-type equipment. PTU personnel may also be trained in crisis negotiation skills. A police tactical unit can be part of either a police force under the authority of civilian officials, or a gendarmerie-style force under the authority of civilian officials (interior ministry) or a defence ministry that may have formal military status. Other government agencies, depending on the country, may establish specialized units with comparable taskings, training, and equipment, such as border guard, coast guard, customs, or corrections. In the United States, police tactical units are known by the generic term of Special Weapons And Tactics (SWAT) teams; the term originated from the Los Angeles Police Department. In Australia, the federal government uses the term police tactical group. The European Union uses the term special intervention unit for national counterterrorist PTUs. Police tactical units have similarities to military special forces units such as organization, selection, training, equipment, and operational methodologies. Police tactical units, similar to military units, are not gender diverse, with female members being rare.