The Royal Fleet Auxiliary (RFA) operates 12 ships which primarily serve to replenish Royal Navy warships at sea, and also augment the Royal Navy's amphibious warfare capabilities through its three vessels.
The Ministry of Defence Police (MDP) has an established strength of 2,700 police officers which provide armed security, counter terrorism, uniformed policing and investigative services to Ministry of Defence property, personnel, and installations throughout the United Kingdom.