Defence Research Establishments
The Defence Research Establishments were a number of separate UK Ministry of Defence Research Establishments, dating back to World War II, World War I, or even earlier.At the beginning of World War II there were about a dozen research and development establishments.PERME became part of the Royal Armament Research and Development Establishment (RARDE).Some of these establishments were merged in 1991 to form the Defence Research Agency (DRA).More were added to DRA in 1995 to form the Defence Evaluation and Research Agency (DERA).