The 28th (Essex) Searchlight Regiment was a volunteer air defence unit of Britain's Territorial Army (TA) from 1935 until 1961, at first as part of the Royal Engineers, later in the Royal Artillery. During the Second World War it defended the approaches to London in The Blitz and Operation Diver before becoming a garrison unit in the liberation of Norway.

29th Anti-Aircraft Brigade was an air defence formation of Britain's Territorial Army (TA) before and during the Second World War. It defended East Anglian airfields and ports during the Battle of Britain and The Blitz. It was reformed in the postwar TA.