English: 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. The fort is located on the top of the North Downs.
The base went on to become home to the Ministry of Supply, from which it became the headquarters of the Royal Armament Research and Development Establishment (RARDE).
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Former MoD establishment in Kent UK. At intervals there is a projection in the fence line. This is presumably to allow those inside to get a good view along the outside of the fence.