Royal Naval Armament Depot
A Royal Naval Armament Depot (RNAD) is an armament depot (or a group of depots) dedicated to supplying the Royal Navy (as well as, at various times, the Royal Air Force, the British Army, and foreign and Commonwealth forces). They were sister depots of Royal Naval Cordite Factories, Royal Naval Torpedo and Royal Naval Mine Depots.
Source: Wikipedia — Royal Naval Armament Depot (CC BY-SA 4.0)