Fort Halstead
（重定向自RARDE）
Fort Halstead is a research site of Dstl, an executive agency of the UK Ministry of Defence. It is situated on the crest of the Kentish North Downs, overlooking the town of Sevenoaks. Originally constructed in 1892 as one of a ring of fortresses around London, Fort Halstead was to be manned by volunteers in the event of a crisis.