This whole area used to be part of the Arborfield Garrison. This building in particular's last use was the officers’ mess for the Royal Electrical and Mechanical Engineers (REME) and was part of the base until the base was released for housing. This building is now owned by Nirvana Spa with plans recently submitted to convert it into a hotel. The fact it is still marked as military is probably because no one has updated the details since it was last updated 5 years ago when it was still part of the military base. I've removed the military designation.