Low Level Bombsight, Mark III use in October 1942. Coastal Command had priority on deliveries and only small numbers reached Bomber Command. The first examples arrived in May 1943 and were fit to Douglas Boston bombers of 2 Group. In 1944 the sight was trialled on the Avro Lancasters of No. 617 Squadron RAF, the Dambusters, who carried out a single low-level attack with them in late 1944. Most examples sent to Bomber Command equipped a small number of De Havilland Mosquito aircraft in No. 627 Squadron RAF (who normally operated as pathfinders) and No. 8 Group RAF (Pathfinder Force). The sight remained with Coastal
Kilroy was here from a diagram of how to approximate a square wave using sine waves, also at RAF Yatesbury and with an instructor named Chadwick. This version was initially called Domie or Doomie, and "Life" noted that Doomie was used by the RAF. REME claimed that the name came from their training school, nicknamed "Chad's Temple"; the RAF claimed that it arose from Chadwick House at a Lancashire radio school; and the Desert Rats claimed that it came from an officer in El Alamein. It is unclear how Chad gained widespread popularity or became conflated with Kilroy. It was, however, widely in