Supply officer was a specialisation in the British Royal Navy which has recently been superseded by the Logistics Officer, recognising the need to align with the nomenclature and function of similar cadres in the British Army and Royal Air Force. Though, initially, employment of Logistics Officers in the Royal Navy remained broadly the same, it has begun to reflect exposure to the 'tri-service' environment, including a significantly greater number of operational logistics posts, as well as the more traditional Cash, Pay and Records, and 'outer-office' or Aide de Camp duties. The Logistics Branch in the Royal Navy is one of the three main branches of the Senior Service, though due to its unique nature has interaction with all branches of the Naval Service, including the Fleet Air Arm and the Royal Marines, as well as the Defence Equipment and Support Organisation, the Ministry of Defence and many other agencies and organisations. In centuries past, the supply officer had been known as the clerk, bursar, purser and, later, the paymaster. Logistics officers are still generally referred to by the historic sobriquet 'pusser', a derivation of 'purser'. History Purser and secretary At first, the business-man and shop-keeper – later to become responsible for pay as well – this officer was first mentioned as a regular member of a ship's company in one of the King's Ships in the fourteenth century. Later known as the clerk and then bursar in the Royal Navy, the name of this warrant officer soon changed to Purser. In the early days, the purser was a privileged shop-keeper on board ship and, as such, the profession was guilty of many malpractices. Samuel Pepys said of the Purser "A purser without professed cheating is a professed loser." By the end of the seventeenth century, a new post of captain's clerk was ordained and all Pursers had to pass through this office; this resulted in promotion to the post of Purser largely resting with ship's captains. Gradually, the status of the Purser rose and he received the uniform of a Warrant Officer in 1787 and a distinctive uniform in 1805. The oldest man in the British fleet at the Battle of Trafalgar, 21 October 1805, was the Purser of Nelson's flagship, HMS Victory, Limerick-born Purser Walter Burke, then 69; he survived a further ten years, dying in September 1815 and his gravestone is in Wouldham churchyard, Kent. Admiral Nelson's secretary,