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Commander (often abbreviated Cdr) is a senior officer rank of the Royal Navy of the United Kingdom. It is immediately junior to captain and immediately senior to the rank of lieutenant commander. Officers holding the junior rank of lieutenant commander are not considered to be commanders. ==History== The title (originally "master and commander")〔See also: ''Master and Commander'' by Patrick O'Brian.〕 originated in the 18th century to describe naval officers who commanded ships of war too large to be commanded by a lieutenant but too small to warrant the assignment of a post-captain, or (before about 1770) a sailing-master; the commanding officer served as his own master. These were usually unrated sloops-of-war of no more than 20 guns, fireships, hospital ships and store ships. Before 1750 the rank was broadly considered as the limit of advancement for those without patronage, especially those who had been promoted from among a ship's crew. By contrast those with Parliamentary supporters or family connections were more likely spend only a nominal period as master and commander of a sloop before being elevated to post-captain. From 1718 the Navy List began recording an officer's date of appointment to the rank of master and commander, with the intention of establishing seniority as a guide to promotion, but there is little evidence that this carried through into actual appointments.〔 Over the later eighteenth century the rank evolved into a more regular stage of service between lieutenant and captain. The Royal Navy shortened "master and commander" to "commander" in 1794; however, the term "master and commander" remained (unofficially) in common parlance for several years. The rank was a popular recognition of service during the Napoleonic Wars, resulting in promotion of more commanders than there were commands; in 1812 the Navy List recorded 586 commanders against 168 available vessels. Commanders unable to secure a ship were left ashore on half-pay, with limited prospects for future advancement. This promotions bottleneck was addressed from 1827 with the introduction of commanders as a second-in-command on larger vessels. In the 20th and 21st centuries, the rank has been assigned the NATO rank code of OF-4. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Commander (Royal Navy)」の詳細全文を読む スポンサード リンク
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