An authorised firearms officer (AFO) is a British police officer who is authorised and trained to carry and use firearms. The designation is significant because most police officers in the United Kingdom do not routinely carry firearms. The only forces where officers are routinely armed are the Police Service of Northern Ireland, the Ministry of Defence Police, the Civil Nuclear Constabulary, Belfast Harbour Police and the Belfast International Airport Constabulary.
In 2019/20 fiscal year, there were 19,372 police operations throughout England and Wales in which the deployment of firearms was authorised and 6,518 firearms officers, 4.9% of the 132,467 active FTE officers. Following the November 2015 Paris attacks, it was decided to significantly increase the numbers of armed officers, particularly in London.
AFOs can be up-skilled with additional qualifications, such as Armed Response Vehicle Officer (ARVO), Specialist Firearms Officer (SFO), and Counter Terrorist Specialist Firearms Officer (CTSFO), alongside other specialities, including rifles.
The term "authorised firearms officer" became the national standard term for a police officer trained in the use of firearms as a result of reforms in the late 1980s which were prompted by the shooting of Stephen Waldorf. The reforms also standardised the training for armed officers and the rank of an officer who could authorise the issuing of firearms. Armed officers on protection duties, such as those guarding embassies or government buildings or acting as bodyguards for government officials or royalty, were granted a standing authority to carry arms without the need for repeated authorisation.
All police forces in the United Kingdom have an AFO selection process, varying slightly between each force. As with many police specialities, all authorised firearms officers have volunteered for the role. Candidates are required to gain approval from their superiors before embarking on a series of interviews, psychological and physical fitness tests, medical examinations and assessment days, before permission to commence firearms training is given.