Weapons deployed by forces are an operational matter for chief officers. The Home Office Scientific Development Branch maintains a database, on behalf of the Association of Chief Police Officers (ACPO), of firearms and ammunition used by authorised firearms officers in the 43 forces in England and Wales. The Attenuated Energy projectile is also available for use by police forces, and Tasers are available for use by authorised firearms officers and specially trained units in line with ACPO Policy and Guidance. Forces also deploy incapacitant spray—both CS and PAVA based—and batons.