When AA Command was disbanded on 10 March 1955 there were wholescale mergers among its subordinate units: 601 (City of Bristol) HAA Rgt amalgamated with 312 (Gloucestershire) and 266 (Gloucestershire Volunteer Artillery) HAA Rgts to form 311 (City of Bristol) Heavy Anti-Aircraft Regiment, Royal Artillery, to which it contributed R (City of Bristol) Bty.