Until the latter part of the 20th century the term 'Military Hospital' in British usage always signified a hospital run by the Army, whereas those run by the Navy were designated Royal Naval Hospitals and those run by the Royal Air Force RAF Hospitals. The last remaining UK military hospitals closed in the 1990s; since then, service personnel (except when deployed on active service) have usually been treated in civilian (NHS) hospitals (some of which have had integrated Ministry of Defence Hospital Units provided as part of their establishment).
