Rapier (missile)
The first Rapier was accurate and simple to use. However, it could not be used in all types of weather. To fix this, BAC started working on a different radar unit. This led to the Marconi DN 181 "Blindfire" radar in 1970. The first Blindfires were sold to the Iranian Army in 1973. The British Army did not buy the Blindfire system until 1979.