Warrant officers hold the King's Warrant; they are not saluted as they do not hold the King's Commission. They are addressed as Sir or Ma'am by NCOs and lower ranks but commissioned officers address warrant officers either by their appointment - sergeant major - or as Mr. followed by their surname - Mr Jones. All branches of Britsh armed services had warrant officers.
Some experts have said that without warrant officers, it is unlikely that the Royal Navy could have retained its supremacy at sea. Warrant officers were in a class of their own who uniquely reported direct to the captain of their ship because they were in charge of specific branches of the ship’s company. As such, their role on board ship and ashore was vital to the smooth running of any operation.
They also reported to the specific naval board which governed their roles. They held a warrant from the Board of Admiralty after having served an apprenticeship and/or undergoing examination.
The term warrant officer dates from the thirteenth century at a time when ships were commanded by noblemen with only some military experience and who therefore depended on those with specialist skills of warrant officers to manage the running of the ship. The ship's master and other warrant officers were experts in the technical aspects of running the ship, vital to the safety of all on board. The warrant officer rank and status was abolished in 1949 only to reappear in a slightly different guise in 1973.
One essential element of running naval ships related to the guns and cannons carried on board. Commanders needed gunnery experts and the first to be employed were warranted gunners in the early sixteenth century. Thus began the specialist roles. Most warrant officers in those days were literate - which distinguished them from the ordinary sailors - and Admiralty regulations stated that no person shall be appointed to any station unless he can read and write and is sufficiently skilled in arithmetic.
The role of warrant officer evolved as technologies advanced; there were five standing warrant officers assigned to each ship, namely the boatswain, gunner, carpenter, purser and surgeon. They were supported by inferior warrant officers who were senior ratings.
In the nineteenth century some warrant officer ranks transferred to commissioned ranks, and with the advent of steam power and the new branch of engineering required, this provided even more opportunity for men to hold a warranted rank.
Warrant officers were those privileged to share the wardroom and quarterdeck with the commissioned officers and those who ranked with more junior members of the ship's crew. Somewhere between the two were the Standing Officers; they remained with the ship, even when it was out of commission for repair, refitting or when laid up. In such cases they were under the pay and supervision of the Royal Dockyards.