on 31 March 2010. Joint Force Harrier's disbandment unexpectedly followed as part of the Strategic Defence and Security Review which was published on 19 October 2010. ASACS training (2021 – present) On 1 June 2021, the squadron number plate was allocated to the RAF's Air Surveillance and Control System (ASACS) Operational Conversion Unit (OCU) based at RAF Boulmer in Northumberland. The ASACS OCU provides basic and advanced air battle management training to British Armed Forces personnel whose role it is to monitor, detect and identify all aircraft in and around UK airspace; and coordinate Quick Reaction Alert aircraft tasked by the UK or NATO. Aircraft operated Royal Aircraft Factory F.E.2B Bristol F.2 Fighter Westland Wapiti Hawker Audax Westland Lysander Hawker Hurricane Supermarine Spitfire Hawker Tempest de Havilland Vampire Canadair Sabre Hawker Hunter Hawker Siddeley Harrier SEPECAT Jaguar Panavia Tornado See also List of Royal Air Force aircraft squadrons References 020 Squadron 020 Squadron Military units and formations established in 1915 Military units and formations of the Gulf War 1915 establishments in the United Kingdom