No. 20 Squadron is the Royal Air Force's Operational Conversion Unit (OCU) for ground-based Tactical Air Command and Control, and Air Battle Management. It is part of the RAF's Air Surveillance and Control System (ASACS) and is based at RAF Boulmer. It was allocated the role on 1 June 2021.
A 20 Squadron sergeant at Monywa, Burma, 1945.
A British Aerospace Harrier GR9 seen in No. 20(R) Squadron markings during 2008
Royal Air Force Boulmer or more simply RAF Boulmer is a Royal Air Force station near Alnwick in Northumberland, England, and is home to Aerospace Surveillance and Control System (ASACS) Force Command, Control and Reporting Centre (CRC) Boulmer.
A Phantom aircraft as gate guardian